Merge branch 'master' into fetched-user

21 files changed, 658 insertions, 284 deletions

diff --git a/Pipfile b/Pipfile
index 48d839fc3..68362ae78 100644
--- a/Pipfile
+++ b/Pipfile
@@ -19,6 +19,7 @@ deepdiff = "~=4.0"
 requests = "~=2.22"
 more_itertools = "~=7.2"
 urllib3 = ">=1.24.2,<1.25"
+prometheus-async = {extras = ["aiohttp"],version = "~=19.2"}
 
 [dev-packages]
 coverage = "~=4.5"
diff --git a/Pipfile.lock b/Pipfile.lock
index 69caf4646..ab5dfb538 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "c27d699b4aeeed204dee41f924f682ae2a670add8549a8826e58776594370582"
+            "sha256": "d9349e8c704b2b2403004039856d8d75aaebc76e4aa93390c4d177f583e73b71"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,11 +18,11 @@
     "default": {
         "aio-pika": {
             "hashes": [
-                "sha256:1da038b3d2c1b49e0e816d87424e702912bb77f9b5197f2bf279217915b4f7ed",
-                "sha256:29fe851374b86c997a22174c04352b5941bc1c2e36bbf542918ac18a76cfc9d3"
+                "sha256:a5837277e53755078db3a9e8c45bbca605c8ba9ecba7a02d74a7a1779f444723",
+                "sha256:fa32e33b4b7d0804dcf439ae6ff24d2f0a83d1ba280ee9f555e647d71d394ff5"
             ],
             "index": "pypi",
-            "version": "==6.3.0"
+            "version": "==6.4.1"
         },
         "aiodns": {
             "hashes": [
@@ -62,10 +62,10 @@
         },
         "aiormq": {
             "hashes": [
-                "sha256:afc0d46837b121585e4faec0a7646706429b4e2f5110ae8d0b5cdc3708b4b0e5",
-                "sha256:dc0fbbc7f8ad5af6a2cc18e00ccc5f925984cde3db6e8fe952c07b7ef157b5f2"
+                "sha256:8c215a970133ab5ee7c478decac55b209af7731050f52d11439fe910fa0f9e9d",
+                "sha256:9210f3389200aee7d8067f6435f4a9eff2d3a30b88beb5eaae406ccc11c0fc01"
             ],
-            "version": "==2.9.1"
+            "version": "==3.2.0"
         },
         "alabaster": {
             "hashes": [
@@ -90,25 +90,25 @@
         },
         "babel": {
             "hashes": [
-                "sha256:af92e6106cb7c55286b25b38ad7695f8b4efb36a90ba483d7f7a6628c46158ab",
-                "sha256:e86135ae101e31e2c8ec20a4e0c5220f4eed12487d5cf3f78be7e98d3a57fc28"
+                "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
+                "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
             ],
-            "version": "==2.7.0"
+            "version": "==2.8.0"
         },
         "beautifulsoup4": {
             "hashes": [
-                "sha256:5279c36b4b2ec2cb4298d723791467e3000e5384a43ea0cdf5d45207c7e97169",
-                "sha256:6135db2ba678168c07950f9a16c4031822c6f4aec75a65e0a97bc5ca09789931",
-                "sha256:dcdef580e18a76d54002088602eba453eec38ebbcafafeaabd8cab12b6155d57"
+                "sha256:05fd825eb01c290877657a56df4c6e4c311b3965bda790c613a3d6fb01a5462a",
+                "sha256:9fbb4d6e48ecd30bcacc5b63b94088192dcda178513b2ae3c394229f8911b887",
+                "sha256:e1505eeed31b0f4ce2dbb3bc8eb256c04cc2b3b72af7d551a4ab6efd5cbe5dae"
             ],
-            "version": "==4.8.1"
+            "version": "==4.8.2"
         },
         "certifi": {
             "hashes": [
-                "sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50",
-                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
+                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
+                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
             ],
-            "version": "==2019.9.11"
+            "version": "==2019.11.28"
         },
         "cffi": {
             "hashes": [
@@ -195,10 +195,10 @@
         },
         "imagesize": {
             "hashes": [
-                "sha256:3f349de3eb99145973fefb7dbe38554414e5c30abd0c8e4b970a7c9d09f3a1d8",
-                "sha256:f3832918bc3c66617f92e35f5d70729187676313caa60c187eb0f28b8fe5e3b5"
+                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
+                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
             ],
-            "version": "==1.1.0"
+            "version": "==1.2.0"
         },
         "jinja2": {
             "hashes": [
@@ -223,35 +223,35 @@
         },
         "lxml": {
             "hashes": [
-                "sha256:02ca7bf899da57084041bb0f6095333e4d239948ad3169443f454add9f4e9cb4",
-                "sha256:096b82c5e0ea27ce9138bcbb205313343ee66a6e132f25c5ed67e2c8d960a1bc",
-                "sha256:0a920ff98cf1aac310470c644bc23b326402d3ef667ddafecb024e1713d485f1",
-                "sha256:1409b14bf83a7d729f92e2a7fbfe7ec929d4883ca071b06e95c539ceedb6497c",
-                "sha256:17cae1730a782858a6e2758fd20dd0ef7567916c47757b694a06ffafdec20046",
-                "sha256:17e3950add54c882e032527795c625929613adbd2ce5162b94667334458b5a36",
-                "sha256:1f4f214337f6ee5825bf90a65d04d70aab05526c08191ab888cb5149501923c5",
-                "sha256:2e8f77db25b0a96af679e64ff9bf9dddb27d379c9900c3272f3041c4d1327c9d",
-                "sha256:4dffd405390a45ecb95ab5ab1c1b847553c18b0ef8ed01e10c1c8b1a76452916",
-                "sha256:6b899931a5648862c7b88c795eddff7588fb585e81cecce20f8d9da16eff96e0",
-                "sha256:726c17f3e0d7a7200718c9a890ccfeab391c9133e363a577a44717c85c71db27",
-                "sha256:760c12276fee05c36f95f8040180abc7fbebb9e5011447a97cdc289b5d6ab6fc",
-                "sha256:796685d3969815a633827c818863ee199440696b0961e200b011d79b9394bbe7",
-                "sha256:891fe897b49abb7db470c55664b198b1095e4943b9f82b7dcab317a19116cd38",
-                "sha256:9277562f175d2334744ad297568677056861070399cec56ff06abbe2564d1232",
-                "sha256:a471628e20f03dcdfde00770eeaf9c77811f0c331c8805219ca7b87ac17576c5",
-                "sha256:a63b4fd3e2cabdcc9d918ed280bdde3e8e9641e04f3c59a2a3109644a07b9832",
-                "sha256:ae88588d687bd476be588010cbbe551e9c2872b816f2da8f01f6f1fda74e1ef0",
-                "sha256:b0b84408d4eabc6de9dd1e1e0bc63e7731e890c0b378a62443e5741cfd0ae90a",
-                "sha256:be78485e5d5f3684e875dab60f40cddace2f5b2a8f7fede412358ab3214c3a6f",
-                "sha256:c27eaed872185f047bb7f7da2d21a7d8913457678c9a100a50db6da890bc28b9",
-                "sha256:c7fccd08b14aa437fe096c71c645c0f9be0655a9b1a4b7cffc77bcb23b3d61d2",
-                "sha256:c81cb40bff373ab7a7446d6bbca0190bccc5be3448b47b51d729e37799bb5692",
-                "sha256:d11874b3c33ee441059464711cd365b89fa1a9cf19ae75b0c189b01fbf735b84",
-                "sha256:e9c028b5897901361d81a4718d1db217b716424a0283afe9d6735fe0caf70f79",
-                "sha256:fe489d486cd00b739be826e8c1be188ddb74c7a1ca784d93d06fda882a6a1681"
-            ],
-            "index": "pypi",
-            "version": "==4.4.1"
+                "sha256:00ac0d64949fef6b3693813fe636a2d56d97a5a49b5bbb86e4cc4cc50ebc9ea2",
+                "sha256:0571e607558665ed42e450d7bf0e2941d542c18e117b1ebbf0ba72f287ad841c",
+                "sha256:0e3f04a7615fdac0be5e18b2406529521d6dbdb0167d2a690ee328bef7807487",
+                "sha256:13cf89be53348d1c17b453867da68704802966c433b2bb4fa1f970daadd2ef70",
+                "sha256:217262fcf6a4c2e1c7cb1efa08bd9ebc432502abc6c255c4abab611e8be0d14d",
+                "sha256:223e544828f1955daaf4cefbb4853bc416b2ec3fd56d4f4204a8b17007c21250",
+                "sha256:277cb61fede2f95b9c61912fefb3d43fbd5f18bf18a14fae4911b67984486f5d",
+                "sha256:3213f753e8ae86c396e0e066866e64c6b04618e85c723b32ecb0909885211f74",
+                "sha256:4690984a4dee1033da0af6df0b7a6bde83f74e1c0c870623797cec77964de34d",
+                "sha256:4fcc472ef87f45c429d3b923b925704aa581f875d65bac80f8ab0c3296a63f78",
+                "sha256:61409bd745a265a742f2693e4600e4dbd45cc1daebe1d5fad6fcb22912d44145",
+                "sha256:678f1963f755c5d9f5f6968dded7b245dd1ece8cf53c1aa9d80e6734a8c7f41d",
+                "sha256:6c6d03549d4e2734133badb9ab1c05d9f0ef4bcd31d83e5d2b4747c85cfa21da",
+                "sha256:6e74d5f4d6ecd6942375c52ffcd35f4318a61a02328f6f1bd79fcb4ffedf969e",
+                "sha256:7b4fc7b1ecc987ca7aaf3f4f0e71bbfbd81aaabf87002558f5bc95da3a865bcd",
+                "sha256:7ed386a40e172ddf44c061ad74881d8622f791d9af0b6f5be20023029129bc85",
+                "sha256:8f54f0924d12c47a382c600c880770b5ebfc96c9fd94cf6f6bdc21caf6163ea7",
+                "sha256:ad9b81351fdc236bda538efa6879315448411a81186c836d4b80d6ca8217cdb9",
+                "sha256:bbd00e21ea17f7bcc58dccd13869d68441b32899e89cf6cfa90d624a9198ce85",
+                "sha256:c3c289762cc09735e2a8f8a49571d0e8b4f57ea831ea11558247b5bdea0ac4db",
+                "sha256:cf4650942de5e5685ad308e22bcafbccfe37c54aa7c0e30cd620c2ee5c93d336",
+                "sha256:cfcbc33c9c59c93776aa41ab02e55c288a042211708b72fdb518221cc803abc8",
+                "sha256:e301055deadfedbd80cf94f2f65ff23126b232b0d1fea28f332ce58137bcdb18",
+                "sha256:ebbfe24df7f7b5c6c7620702496b6419f6a9aa2fd7f005eb731cc80d7b4692b9",
+                "sha256:eff69ddbf3ad86375c344339371168640951c302450c5d3e9936e98d6459db06",
+                "sha256:f6ed60a62c5f1c44e789d2cf14009423cb1646b44a43e40a9cf6a21f077678a1"
+            ],
+            "index": "pypi",
+            "version": "==4.4.2"
         },
         "markdownify": {
             "hashes": [
@@ -303,37 +303,25 @@
         },
         "multidict": {
             "hashes": [
-                "sha256:024b8129695a952ebd93373e45b5d341dbb87c17ce49637b34000093f243dd4f",
-                "sha256:041e9442b11409be5e4fc8b6a97e4bcead758ab1e11768d1e69160bdde18acc3",
-                "sha256:045b4dd0e5f6121e6f314d81759abd2c257db4634260abcfe0d3f7083c4908ef",
-                "sha256:047c0a04e382ef8bd74b0de01407e8d8632d7d1b4db6f2561106af812a68741b",
-                "sha256:068167c2d7bbeebd359665ac4fff756be5ffac9cda02375b5c5a7c4777038e73",
-                "sha256:148ff60e0fffa2f5fad2eb25aae7bef23d8f3b8bdaf947a65cdbe84a978092bc",
-                "sha256:1d1c77013a259971a72ddaa83b9f42c80a93ff12df6a4723be99d858fa30bee3",
-                "sha256:1d48bc124a6b7a55006d97917f695effa9725d05abe8ee78fd60d6588b8344cd",
-                "sha256:31dfa2fc323097f8ad7acd41aa38d7c614dd1960ac6681745b6da124093dc351",
-                "sha256:34f82db7f80c49f38b032c5abb605c458bac997a6c3142e0d6c130be6fb2b941",
-                "sha256:3d5dd8e5998fb4ace04789d1d008e2bb532de501218519d70bb672c4c5a2fc5d",
-                "sha256:4a6ae52bd3ee41ee0f3acf4c60ceb3f44e0e3bc52ab7da1c2b2aa6703363a3d1",
-                "sha256:4b02a3b2a2f01d0490dd39321c74273fed0568568ea0e7ea23e02bd1fb10a10b",
-                "sha256:4b843f8e1dd6a3195679d9838eb4670222e8b8d01bc36c9894d6c3538316fa0a",
-                "sha256:5de53a28f40ef3c4fd57aeab6b590c2c663de87a5af76136ced519923d3efbb3",
-                "sha256:61b2b33ede821b94fa99ce0b09c9ece049c7067a33b279f343adfe35108a4ea7",
-                "sha256:6a3a9b0f45fd75dc05d8e93dc21b18fc1670135ec9544d1ad4acbcf6b86781d0",
-                "sha256:76ad8e4c69dadbb31bad17c16baee61c0d1a4a73bed2590b741b2e1a46d3edd0",
-                "sha256:7ba19b777dc00194d1b473180d4ca89a054dd18de27d0ee2e42a103ec9b7d014",
-                "sha256:7c1b7eab7a49aa96f3db1f716f0113a8a2e93c7375dd3d5d21c4941f1405c9c5",
-                "sha256:7fc0eee3046041387cbace9314926aa48b681202f8897f8bff3809967a049036",
-                "sha256:8ccd1c5fff1aa1427100ce188557fc31f1e0a383ad8ec42c559aabd4ff08802d",
-                "sha256:8e08dd76de80539d613654915a2f5196dbccc67448df291e69a88712ea21e24a",
-                "sha256:c18498c50c59263841862ea0501da9f2b3659c00db54abfbf823a80787fde8ce",
-                "sha256:c49db89d602c24928e68c0d510f4fcf8989d77defd01c973d6cbe27e684833b1",
-                "sha256:ce20044d0317649ddbb4e54dab3c1bcc7483c78c27d3f58ab3d0c7e6bc60d26a",
-                "sha256:d1071414dd06ca2eafa90c85a079169bfeb0e5f57fd0b45d44c092546fcd6fd9",
-                "sha256:d3be11ac43ab1a3e979dac80843b42226d5d3cccd3986f2e03152720a4297cd7",
-                "sha256:db603a1c235d110c860d5f39988ebc8218ee028f07a7cbc056ba6424372ca31b"
-            ],
-            "version": "==4.5.2"
+                "sha256:13f3ebdb5693944f52faa7b2065b751cb7e578b8dd0a5bb8e4ab05ad0188b85e",
+                "sha256:26502cefa86d79b86752e96639352c7247846515c864d7c2eb85d036752b643c",
+                "sha256:4fba5204d32d5c52439f88437d33ad14b5f228e25072a192453f658bddfe45a7",
+                "sha256:527124ef435f39a37b279653ad0238ff606b58328ca7989a6df372fd75d7fe26",
+                "sha256:5414f388ffd78c57e77bd253cf829373721f450613de53dc85a08e34d806e8eb",
+                "sha256:5eee66f882ab35674944dfa0d28b57fa51e160b4dce0ce19e47f495fdae70703",
+                "sha256:63810343ea07f5cd86ba66ab66706243a6f5af075eea50c01e39b4ad6bc3c57a",
+                "sha256:6bd10adf9f0d6a98ccc792ab6f83d18674775986ba9bacd376b643fe35633357",
+                "sha256:83c6ddf0add57c6b8a7de0bc7e2d656be3eefeff7c922af9a9aae7e49f225625",
+                "sha256:93166e0f5379cf6cd29746989f8a594fa7204dcae2e9335ddba39c870a287e1c",
+                "sha256:9a7b115ee0b9b92d10ebc246811d8f55d0c57e82dbb6a26b23c9a9a6ad40ce0c",
+                "sha256:a38baa3046cce174a07a59952c9f876ae8875ef3559709639c17fdf21f7b30dd",
+                "sha256:a6d219f49821f4b2c85c6d426346a5d84dab6daa6f85ca3da6c00ed05b54022d",
+                "sha256:a8ed33e8f9b67e3b592c56567135bb42e7e0e97417a4b6a771e60898dfd5182b",
+                "sha256:d7d428488c67b09b26928950a395e41cc72bb9c3d5abfe9f0521940ee4f796d4",
+                "sha256:dcfed56aa085b89d644af17442cdc2debaa73388feba4b8026446d168ca8dad7",
+                "sha256:f29b885e4903bd57a7789f09fe9d60b6475a6c1a4c0eca874d8558f00f9d4b51"
+            ],
+            "version": "==4.7.4"
         },
         "ordered-set": {
             "hashes": [
@@ -343,10 +331,10 @@
         },
         "packaging": {
             "hashes": [
-                "sha256:28b924174df7a2fa32c1953825ff29c61e2f5e082343165438812f00d3a7fc47",
-                "sha256:d9551545c6d761f3def1677baf08ab2a3ca17c56879e70fecba2fc4dde4ed108"
+                "sha256:aec3fdbb8bc9e4bb65f0634b9f551ced63983a529d6a8931817d52fdd0816ddb",
+                "sha256:fe1d8331dfa7cc0a883b49d75fc76380b2ab2734b220fbb87d774e4fd4b851f8"
             ],
-            "version": "==19.2"
+            "version": "==20.0"
         },
         "pamqp": {
             "hashes": [
@@ -355,23 +343,56 @@
             ],
             "version": "==2.3.0"
         },
+        "prometheus-async": {
+            "extras": [
+                "aiohttp"
+            ],
+            "hashes": [
+                "sha256:227f516e5bf98a0dc602348381e182358f8b2ed24a8db05e8e34d9cf027bab83",
+                "sha256:3cc68d1f39e9bbf16dbd0b51103d87671b3cbd1d75a72cda472cd9a35cc9d0d2"
+            ],
+            "index": "pypi",
+            "version": "==19.2.0"
+        },
+        "prometheus-client": {
+            "hashes": [
+                "sha256:71cd24a2b3eb335cb800c7159f423df1bd4dcd5171b234be15e3f31ec9f622da"
+            ],
+            "version": "==0.7.1"
+        },
         "pycares": {
             "hashes": [
-                "sha256:2ca080db265ea238dc45f997f94effb62b979a617569889e265c26a839ed6305",
-                "sha256:6f79c6afb6ce603009db2042fddc2e348ad093ece9784cbe2daa809499871a23",
-                "sha256:70918d06eb0603016d37092a5f2c0228509eb4e6c5a3faacb4184f6ab7be7650",
-                "sha256:755187d28d24a9ea63aa2b4c0638be31d65fbf7f0ce16d41261b9f8cb55a1b99",
-                "sha256:7baa4b1f2146eb8423ff8303ebde3a20fb444a60db761fba0430d104fe35ddbf",
-                "sha256:90b27d4df86395f465a171386bc341098d6d47b65944df46518814ae298f6cc6",
-                "sha256:9e090dd6b2afa65cb51c133883b2bf2240fd0f717b130b0048714b33fb0f47ce",
-                "sha256:a11b7d63c3718775f6e805d6464cb10943780395ab042c7e5a0a7a9f612735dd",
-                "sha256:b253f5dcaa0ac7076b79388a3ac80dd8f3bd979108f813baade40d3a9b8bf0bd",
-                "sha256:c7f4f65e44ba35e35ad3febc844270665bba21cfb0fb7d749434e705b556e087",
-                "sha256:cdb342e6a254f035bd976d95807a2184038fc088d957a5104dcaab8be602c093",
-                "sha256:cf08e164f8bfb83b9fe633feb56f2754fae6baefcea663593794fa0518f8f98c",
-                "sha256:df9bc694cf03673878ea8ce674082c5acd134991d64d6c306d4bd61c0c1df98f"
-            ],
-            "version": "==3.0.0"
+                "sha256:050f00b39ed77ea8a4e555f09417d4b1a6b5baa24bb9531a3e15d003d2319b3f",
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+                "sha256:2e4f74677542737fb5af4ea9a2e415ec5ab31aa67e7b8c3c969fdb15c069f679",
+                "sha256:48a7750f04e69e1f304f4332b755728067e7c4b1abe2760bba1cacd9ff7a847a",
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+                "sha256:81edb016d9e43dde7473bc3999c29cdfee3a6b67308fed1ea21049f458e83ae0",
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+                "sha256:a05bbfdfd41f8410a905a818f329afe7510cbd9ee65c60f8860a72b6c64ce5dc",
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+                "sha256:cce46dd4717debfd2aab79d6d7f0cbdf6b1e982dc4d9bebad81658d59ede07c2",
+                "sha256:cfdd1f90bcf373b00f4b2c55ea47868616fe2f779f792fc913fa82a3d64ffe43",
+                "sha256:d88a279cbc5af613f73e86e19b3f63850f7a2e2736e249c51995dedcc830b1bb",
+                "sha256:eba9a9227438da5e78fc8eee32f32eb35d9a50cf0a0bd937eb6275c7cc3015fe",
+                "sha256:eee7b6a5f5b5af050cb7d66ab28179287b416f06d15a8974ac831437fec51336",
+                "sha256:f41ac1c858687e53242828c9f59c2e7b0b95dbcd5bdd09c7e5d3c48b0f89a25a",
+                "sha256:f8deaefefc3a589058df1b177275f79233e8b0eeee6734cf4336d80164ecd022",
+                "sha256:fa78e919f3bd7d6d075db262aa41079b4c02da315c6043c6f43881e2ebcdd623",
+                "sha256:fadb97d2e02dabdc15a0091591a972a938850d79ddde23d385d813c1731983f0"
+            ],
+            "version": "==3.1.1"
         },
         "pycparser": {
             "hashes": [
@@ -381,17 +402,17 @@
         },
         "pygments": {
             "hashes": [
-                "sha256:71e430bc85c88a430f000ac1d9b331d2407f681d6f6aec95e8bcfbc3df5b0127",
-                "sha256:881c4c157e45f30af185c1ffe8d549d48ac9127433f2c380c24b84572ad66297"
+                "sha256:2a3fe295e54a20164a9df49c75fa58526d3be48e14aceba6d6b1e8ac0bfd6f1b",
+                "sha256:98c8aa5a9f778fcd1026a17361ddaf7330d1b7c62ae97c3bb0ae73e0b9b6b0fe"
             ],
-            "version": "==2.4.2"
+            "version": "==2.5.2"
         },
         "pyparsing": {
             "hashes": [
-                "sha256:20f995ecd72f2a1f4bf6b072b63b22e2eb457836601e76d6e5dfcd75436acc1f",
-                "sha256:4ca62001be367f01bd3e92ecbb79070272a9d4964dce6a48a82ff0b8bc7e683a"
+                "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f",
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-            "version": "==2.4.5"
+            "version": "==2.4.6"
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         "python-dateutil": {
             "hashes": [
@@ -416,22 +437,20 @@
         },
         "pyyaml": {
             "hashes": [
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-                "sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8"
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+                "sha256:1cf708e2ac57f3aabc87405f04b86354f66799c8e62c28c5fc5f88b5521b2dbf",
+                "sha256:24521fa2890642614558b492b473bee0ac1f8057a7263156b02e8b14c88ce6f5",
+                "sha256:4fee71aa5bc6ed9d5f116327c04273e25ae31a3020386916905767ec4fc5317e",
+                "sha256:70024e02197337533eef7b85b068212420f950319cc8c580261963aefc75f811",
+                "sha256:74782fbd4d4f87ff04159e986886931456a1894c61229be9eaf4de6f6e44b99e",
+                "sha256:940532b111b1952befd7db542c370887a8611660d2b9becff75d39355303d82d",
+                "sha256:cb1f2f5e426dc9f07a7681419fe39cee823bb74f723f36f70399123f439e9b20",
+                "sha256:dbbb2379c19ed6042e8f11f2a2c66d39cceb8aeace421bfc29d085d93eda3689",
+                "sha256:e3a057b7a64f1222b56e47bcff5e4b94c4f61faac04c7c4ecb1985e18caa3994",
+                "sha256:e9f45bd5b92c7974e59bcd2dcc8631a6b6cc380a904725fce7bc08872e691615"
             ],
             "index": "pypi",
-            "version": "==5.1.2"
+            "version": "==5.3"
         },
         "requests": {
             "hashes": [
@@ -464,11 +483,11 @@
         },
         "sphinx": {
             "hashes": [
-                "sha256:31088dfb95359384b1005619827eaee3056243798c62724fd3fa4b84ee4d71bd",
-                "sha256:52286a0b9d7caa31efee301ec4300dbdab23c3b05da1c9024b4e84896fb73d79"
+                "sha256:298537cb3234578b2d954ff18c5608468229e116a9757af3b831c2b2b4819159",
+                "sha256:e6e766b74f85f37a5f3e0773a1e1be8db3fcb799deb58ca6d18b70b0b44542a5"
             ],
             "index": "pypi",
-            "version": "==2.2.1"
+            "version": "==2.3.1"
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         "sphinxcontrib-applehelp": {
             "hashes": [
@@ -546,21 +565,33 @@
             ],
             "version": "==6.0"
         },
-        "yarl": {
+        "wrapt": {
             "hashes": [
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-                "sha256:e060906c0c585565c718d1c3841747b61c5439af2211e185f6739a9412dfbde1"
+                "sha256:565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"
             ],
-            "version": "==1.3.0"
+            "version": "==1.11.2"
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+        "yarl": {
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+                "sha256:0ca2f395591bbd85ddd50a82eb1fde9c1066fafe888c5c7cc1d810cf03fd3cc6",
+                "sha256:2098a4b4b9d75ee352807a95cdf5f10180db903bc5b7270715c6bbe2551f64ce",
+                "sha256:25e66e5e2007c7a39541ca13b559cd8ebc2ad8fe00ea94a2aad28a9b1e44e5ae",
+                "sha256:26d7c90cb04dee1665282a5d1a998defc1a9e012fdca0f33396f81508f49696d",
+                "sha256:308b98b0c8cd1dfef1a0311dc5e38ae8f9b58349226aa0533f15a16717ad702f",
+                "sha256:3ce3d4f7c6b69c4e4f0704b32eca8123b9c58ae91af740481aa57d7857b5e41b",
+                "sha256:58cd9c469eced558cd81aa3f484b2924e8897049e06889e8ff2510435b7ef74b",
+                "sha256:5b10eb0e7f044cf0b035112446b26a3a2946bca9d7d7edb5e54a2ad2f6652abb",
+                "sha256:6faa19d3824c21bcbfdfce5171e193c8b4ddafdf0ac3f129ccf0cdfcb083e462",
+                "sha256:944494be42fa630134bf907714d40207e646fd5a94423c90d5b514f7b0713fea",
+                "sha256:a161de7e50224e8e3de6e184707476b5a989037dcb24292b391a3d66ff158e70",
+                "sha256:a4844ebb2be14768f7994f2017f70aca39d658a96c786211be5ddbe1c68794c1",
+                "sha256:c2b509ac3d4b988ae8769901c66345425e361d518aecbe4acbfc2567e416626a",
+                "sha256:c9959d49a77b0e07559e579f38b2f3711c2b8716b8410b320bf9713013215a1b",
+                "sha256:d8cdee92bc930d8b09d8bd2043cedd544d9c8bd7436a77678dd602467a993080",
+                "sha256:e15199cdb423316e15f108f51249e44eb156ae5dba232cb73be555324a1d49c2"
+            ],
+            "version": "==1.4.2"
         }
     },
     "develop": {
@@ -580,10 +611,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50",
-                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
+                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
+                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
             ],
-            "version": "==2019.9.11"
+            "version": "==2019.11.28"
         },
         "cfgv": {
             "hashes": [
@@ -646,10 +677,11 @@
         },
         "dodgy": {
             "hashes": [
-                "sha256:65e13cf878d7aff129f1461c13cb5fd1bb6dfe66bb5327e09379c3877763280c"
+                "sha256:28323cbfc9352139fdd3d316fa17f325cc0e9ac74438cbba51d70f9b48f86c3a",
+                "sha256:51f54c0fd886fa3854387f354b19f429d38c04f984f38bc572558b703c0542a6"
             ],
             "index": "pypi",
-            "version": "==0.1.9"
+            "version": "==0.2.1"
         },
         "dparse": {
             "hashes": [
@@ -675,11 +707,11 @@
         },
         "flake8-annotations": {
             "hashes": [
-                "sha256:6ac7ca1e706307686b60af8043ff1db31dc2cfc1233c8210d67a3d9b8f364736",
-                "sha256:b51131007000d67217608fa028a35ff80aa400b474e5972f1f99c2cf9d26bd2e"
+                "sha256:05b85538014c850a86dce7374bb6621c64481c24e35e8e90af1315f4d7a3dbaa",
+                "sha256:43e5233a76fda002b91a54a7cc4510f099c4bfd6279502ec70164016250eebd1"
             ],
             "index": "pypi",
-            "version": "==1.1.0"
+            "version": "==1.1.3"
         },
         "flake8-bugbear": {
             "hashes": [
@@ -730,10 +762,10 @@
         },
         "identify": {
             "hashes": [
-                "sha256:4f1fe9a59df4e80fcb0213086fcf502bc1765a01ea4fe8be48da3b65afd2a017",
-                "sha256:d8919589bd2a5f99c66302fec0ef9027b12ae150b0b0213999ad3f695fc7296e"
+                "sha256:6f44e637caa40d1b4cb37f6ed3b262ede74901d28b1cc5b1fc07360871edd65d",
+                "sha256:72e9c4ed3bc713c7045b762b0d2e2115c572b85abfc1f4604f5a4fd4c6642b71"
             ],
-            "version": "==1.4.7"
+            "version": "==1.4.9"
         },
         "idna": {
             "hashes": [
@@ -744,11 +776,11 @@
         },
         "importlib-metadata": {
             "hashes": [
-                "sha256:aa18d7378b00b40847790e7c27e11673d7fed219354109d0e7b9e5b25dc3ad26",
-                "sha256:d5f18a79777f3aa179c145737780282e27b508fc8fd688cb17c7a813e8bd39af"
+                "sha256:bdd9b7c397c273bcc9a11d6629a38487cd07154fa255a467bf704cd2c258e359",
+                "sha256:f17c015735e1a88296994c0697ecea7e11db24290941983b08c9feb30921e6d8"
             ],
             "markers": "python_version < '3.8'",
-            "version": "==0.23"
+            "version": "==1.4.0"
         },
         "mccabe": {
             "hashes": [
@@ -767,24 +799,24 @@
         },
         "nodeenv": {
             "hashes": [
-                "sha256:ad8259494cf1c9034539f6cced78a1da4840a4b157e23640bc4a0c0546b0cb7a"
+                "sha256:561057acd4ae3809e665a9aaaf214afff110bbb6a6d5c8a96121aea6878408b3"
             ],
-            "version": "==1.3.3"
+            "version": "==1.3.4"
         },
         "packaging": {
             "hashes": [
-                "sha256:28b924174df7a2fa32c1953825ff29c61e2f5e082343165438812f00d3a7fc47",
-                "sha256:d9551545c6d761f3def1677baf08ab2a3ca17c56879e70fecba2fc4dde4ed108"
+                "sha256:aec3fdbb8bc9e4bb65f0634b9f551ced63983a529d6a8931817d52fdd0816ddb",
+                "sha256:fe1d8331dfa7cc0a883b49d75fc76380b2ab2734b220fbb87d774e4fd4b851f8"
             ],
-            "version": "==19.2"
+            "version": "==20.0"
         },
         "pre-commit": {
             "hashes": [
-                "sha256:9f152687127ec90642a2cc3e4d9e1e6240c4eb153615cb02aa1ad41d331cbb6e",
-                "sha256:c2e4810d2d3102d354947907514a78c5d30424d299dc0fe48f5aa049826e9b50"
+                "sha256:8f48d8637bdae6fa70cc97db9c1dd5aa7c5c8bf71968932a380628c25978b850",
+                "sha256:f92a359477f3252452ae2e8d3029de77aec59415c16ae4189bcfba40b757e029"
             ],
             "index": "pypi",
-            "version": "==1.20.0"
+            "version": "==1.21.0"
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         "pycodestyle": {
             "hashes": [
@@ -795,10 +827,10 @@
         },
         "pydocstyle": {
             "hashes": [
-                "sha256:04c84e034ebb56eb6396c820442b8c4499ac5eb94a3bda88951ac3dc519b6058",
-                "sha256:66aff87ffe34b1e49bff2dd03a88ce6843be2f3346b0c9814410d34987fbab59"
+                "sha256:da7831660b7355307b32778c4a0dbfb137d89254ef31a2b2978f50fc0b4d7586",
+                "sha256:f4f5d210610c2d153fae39093d44224c17429e2ad7da12a8b419aba5c2f614b5"
             ],
-            "version": "==4.0.1"
+            "version": "==5.0.2"
         },
         "pyflakes": {
             "hashes": [
@@ -809,29 +841,27 @@
         },
         "pyparsing": {
             "hashes": [
-                "sha256:20f995ecd72f2a1f4bf6b072b63b22e2eb457836601e76d6e5dfcd75436acc1f",
-                "sha256:4ca62001be367f01bd3e92ecbb79070272a9d4964dce6a48a82ff0b8bc7e683a"
+                "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f",
+                "sha256:c342dccb5250c08d45fd6f8b4a559613ca603b57498511740e65cd11a2e7dcec"
             ],
-            "version": "==2.4.5"
+            "version": "==2.4.6"
         },
         "pyyaml": {
             "hashes": [
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-                "sha256:b0997827b4f6a7c286c01c5f60384d218dca4ed7d9efa945c3e1aa623d5709ae",
-                "sha256:b631ef96d3222e62861443cc89d6563ba3eeb816eeb96b2629345ab795e53681",
-                "sha256:bf47c0607522fdbca6c9e817a6e81b08491de50f3766a7a0e6a5be7905961b41",
-                "sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8"
+                "sha256:059b2ee3194d718896c0ad077dd8c043e5e909d9180f387ce42012662a4946d6",
+                "sha256:1cf708e2ac57f3aabc87405f04b86354f66799c8e62c28c5fc5f88b5521b2dbf",
+                "sha256:24521fa2890642614558b492b473bee0ac1f8057a7263156b02e8b14c88ce6f5",
+                "sha256:4fee71aa5bc6ed9d5f116327c04273e25ae31a3020386916905767ec4fc5317e",
+                "sha256:70024e02197337533eef7b85b068212420f950319cc8c580261963aefc75f811",
+                "sha256:74782fbd4d4f87ff04159e986886931456a1894c61229be9eaf4de6f6e44b99e",
+                "sha256:940532b111b1952befd7db542c370887a8611660d2b9becff75d39355303d82d",
+                "sha256:cb1f2f5e426dc9f07a7681419fe39cee823bb74f723f36f70399123f439e9b20",
+                "sha256:dbbb2379c19ed6042e8f11f2a2c66d39cceb8aeace421bfc29d085d93eda3689",
+                "sha256:e3a057b7a64f1222b56e47bcff5e4b94c4f61faac04c7c4ecb1985e18caa3994",
+                "sha256:e9f45bd5b92c7974e59bcd2dcc8631a6b6cc380a904725fce7bc08872e691615"
             ],
             "index": "pypi",
-            "version": "==5.1.2"
+            "version": "==5.3"
         },
         "requests": {
             "hashes": [
@@ -893,6 +923,7 @@
                 "sha256:fdc1c9bbf79510b76408840e009ed65958feba92a88833cdceecff93ae8fff66",
                 "sha256:ffde2fbfad571af120fcbfbbc61c72469e72f550d676c3342492a9dfdefb8f12"
             ],
+            "markers": "python_version < '3.8'",
             "version": "==1.4.0"
         },
         "unittest-xml-reporting": {
@@ -913,10 +944,10 @@
         },
         "virtualenv": {
             "hashes": [
-                "sha256:11cb4608930d5fd3afb545ecf8db83fa50e1f96fc4fca80c94b07d2c83146589",
-                "sha256:d257bb3773e48cac60e475a19b608996c73f4d333b3ba2e4e57d5ac6134e0136"
+                "sha256:0d62c70883c0342d59c11d0ddac0d954d0431321a41ab20851facf2b222598f3",
+                "sha256:55059a7a676e4e19498f1aad09b8313a38fcc0cdbe4fdddc0e9b06946d21b4bb"
             ],
-            "version": "==16.7.7"
+            "version": "==16.7.9"
         },
         "zipp": {
             "hashes": [
diff --git a/README.md b/README.md
index 7a7f1b992..1e7b21271 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Python Utility Bot
 
-[![Discord](https://img.shields.io/discord/267624335836053506?color=%237289DA&label=Python%20Discord&logo=discord&logoColor=white)](https://discord.gg/2B963hn)
+[![Discord](https://img.shields.io/static/v1?label=Python%20Discord&logo=discord&message=%3E30k%20members&color=%237289DA&logoColor=white)](https://discord.gg/2B963hn)
 [![Build Status](https://dev.azure.com/python-discord/Python%20Discord/_apis/build/status/Bot?branchName=master)](https://dev.azure.com/python-discord/Python%20Discord/_build/latest?definitionId=1&branchName=master)
 [![Tests](https://img.shields.io/azure-devops/tests/python-discord/Python%20Discord/1?compact_message)](https://dev.azure.com/python-discord/Python%20Discord/_apis/build/status/Bot?branchName=master)
 [![Coverage](https://img.shields.io/azure-devops/coverage/python-discord/Python%20Discord/1/master)](https://dev.azure.com/python-discord/Python%20Discord/_apis/build/status/Bot?branchName=master)
diff --git a/bot/__init__.py b/bot/__init__.py
index 4a2df730d..789ace5c0 100644
--- a/bot/__init__.py
+++ b/bot/__init__.py
@@ -6,6 +6,7 @@ from pathlib import Path
 
 from logmatic import JsonFormatter
 
+
 logging.TRACE = 5
 logging.addLevelName(logging.TRACE, "TRACE")
 
diff --git a/bot/__main__.py b/bot/__main__.py
index 84bc7094b..61271a692 100644
--- a/bot/__main__.py
+++ b/bot/__main__.py
@@ -40,6 +40,7 @@ bot.load_extension("bot.cogs.duck_pond")
 bot.load_extension("bot.cogs.free")
 bot.load_extension("bot.cogs.information")
 bot.load_extension("bot.cogs.jams")
+bot.load_extension("bot.cogs.metrics")
 bot.load_extension("bot.cogs.moderation")
 bot.load_extension("bot.cogs.off_topic_names")
 bot.load_extension("bot.cogs.reddit")
diff --git a/bot/bot.py b/bot/bot.py
index 8f808272f..930aaf70e 100644
--- a/bot/bot.py
+++ b/bot/bot.py
@@ -4,6 +4,7 @@ from typing import Optional
 
 import aiohttp
 from discord.ext import commands
+from prometheus_async.aio.web import start_http_server as start_prometheus_http_server
 
 from bot import api
 
@@ -50,4 +51,6 @@ class Bot(commands.Bot):
         """Open an aiohttp session before logging in and connecting to Discord."""
         self.http_session = aiohttp.ClientSession(connector=self.connector)
 
+        await start_prometheus_http_server(addr="0.0.0.0", port=9330)
+        log.debug("Started Prometheus server on port 9330.")
         await super().start(*args, **kwargs)
diff --git a/bot/cogs/alias.py b/bot/cogs/alias.py
index 197155456..0b800575f 100644
--- a/bot/cogs/alias.py
+++ b/bot/cogs/alias.py
@@ -2,7 +2,10 @@ import inspect
 import logging
 
 from discord import Colour, Embed
-from discord.ext.commands import Cog, Command, Context, clean_content, command, group
+from discord.ext.commands import (
+    Cog, Command, Context, Greedy,
+    clean_content, command, group,
+)
 
 from bot.bot import Bot
 from bot.cogs.extensions import Extension
@@ -79,7 +82,7 @@ class Alias (Cog):
         await self.invoke(ctx, "site faq")
 
     @command(name="rules", aliases=("rule",), hidden=True)
-    async def site_rules_alias(self, ctx: Context, *rules: int) -> None:
+    async def site_rules_alias(self, ctx: Context, rules: Greedy[int], *_: str) -> None:
         """Alias for invoking <prefix>site rules."""
         await self.invoke(ctx, "site rules", *rules)
 
diff --git a/bot/cogs/doc.py b/bot/cogs/doc.py
index 9506b195a..6e7c00b6a 100644
--- a/bot/cogs/doc.py
+++ b/bot/cogs/doc.py
@@ -5,6 +5,7 @@ import re
 import textwrap
 from collections import OrderedDict
 from contextlib import suppress
+from types import SimpleNamespace
 from typing import Any, Callable, Optional, Tuple
 
 import discord
@@ -27,6 +28,16 @@ from bot.pagination import LinePaginator
 log = logging.getLogger(__name__)
 logging.getLogger('urllib3').setLevel(logging.WARNING)
 
+# Since Intersphinx is intended to be used with Sphinx,
+# we need to mock its configuration.
+SPHINX_MOCK_APP = SimpleNamespace(
+    config=SimpleNamespace(
+        intersphinx_timeout=3,
+        tls_verify=True,
+        user_agent="python3:python-discord/bot:1.0.0"
+    )
+)
+
 NO_OVERRIDE_GROUPS = (
     "2to3fixer",
     "token",
@@ -102,18 +113,6 @@ def markdownify(html: str) -> DocMarkdownConverter:
     return DocMarkdownConverter(bullets='•').convert(html)
 
 
-class DummyObject(object):
-    """A dummy object which supports assigning anything, which the builtin `object()` does not support normally."""
-
-
-class SphinxConfiguration:
-    """Dummy configuration for use with intersphinx."""
-
-    config = DummyObject()
-    config.intersphinx_timeout = 3
-    config.tls_verify = True
-
-
 class InventoryURL(commands.Converter):
     """
     Represents an Intersphinx inventory URL.
@@ -128,7 +127,7 @@ class InventoryURL(commands.Converter):
     async def convert(ctx: commands.Context, url: str) -> str:
         """Convert url to Intersphinx inventory URL."""
         try:
-            intersphinx.fetch_inventory(SphinxConfiguration(), '', url)
+            intersphinx.fetch_inventory(SPHINX_MOCK_APP, '', url)
         except AttributeError:
             raise commands.BadArgument(f"Failed to fetch Intersphinx inventory from URL `{url}`.")
         except ConnectionError:
@@ -162,7 +161,7 @@ class Doc(commands.Cog):
         await self.refresh_inventory()
 
     async def update_single(
-        self, package_name: str, base_url: str, inventory_url: str, config: SphinxConfiguration
+        self, package_name: str, base_url: str, inventory_url: str
     ) -> None:
         """
         Rebuild the inventory for a single package.
@@ -173,12 +172,10 @@ class Doc(commands.Cog):
                 absolute paths that link to specific symbols
             * `inventory_url` is the absolute URL to the intersphinx inventory, fetched by running
                 `intersphinx.fetch_inventory` in an executor on the bot's event loop
-            * `config` is a `SphinxConfiguration` instance to mock the regular sphinx
-                project layout, required for use with intersphinx
         """
         self.base_urls[package_name] = base_url
 
-        package = await self._fetch_inventory(inventory_url, config)
+        package = await self._fetch_inventory(inventory_url)
         if not package:
             return None
 
@@ -220,15 +217,11 @@ class Doc(commands.Cog):
         self.renamed_symbols.clear()
         async_cache.cache = OrderedDict()
 
-        # Since Intersphinx is intended to be used with Sphinx,
-        # we need to mock its configuration.
-        config = SphinxConfiguration()
-
         # Run all coroutines concurrently - since each of them performs a HTTP
         # request, this speeds up fetching the inventory data heavily.
         coros = [
             self.update_single(
-                package["package"], package["base_url"], package["inventory_url"], config
+                package["package"], package["base_url"], package["inventory_url"]
             ) for package in await self.bot.api_client.get('bot/documentation-links')
         ]
         await asyncio.gather(*coros)
@@ -306,10 +299,17 @@ class Doc(commands.Cog):
         # of a double newline (interpreted as a paragraph) before index 1000.
         if len(description) > 1000:
             shortened = description[:1000]
-            last_paragraph_end = shortened.rfind('\n\n', 100)
-            if last_paragraph_end == -1:
-                last_paragraph_end = shortened.rfind('. ')
-            description = description[:last_paragraph_end]
+            description_cutoff = shortened.rfind('\n\n', 100)
+            if description_cutoff == -1:
+                # Search the shortened version for cutoff points in decreasing desirability,
+                # cutoff at 1000 if none are found.
+                for string in (". ", ", ", ",", " "):
+                    description_cutoff = shortened.rfind(string)
+                    if description_cutoff != -1:
+                        break
+                else:
+                    description_cutoff = 1000
+            description = description[:description_cutoff]
 
             # If there is an incomplete code block, cut it out
             if description.count("```") % 2:
@@ -318,7 +318,6 @@ class Doc(commands.Cog):
             description += f"... [read more]({permalink})"
 
         description = WHITESPACE_AFTER_NEWLINES_RE.sub('', description)
-
         if signatures is None:
             # If symbol is a module, don't show signature.
             embed_description = description
@@ -470,9 +469,9 @@ class Doc(commands.Cog):
         )
         await ctx.send(embed=embed)
 
-    async def _fetch_inventory(self, inventory_url: str, config: SphinxConfiguration) -> Optional[dict]:
+    async def _fetch_inventory(self, inventory_url: str) -> Optional[dict]:
         """Get and return inventory from `inventory_url`. If fetching fails, return None."""
-        fetch_func = functools.partial(intersphinx.fetch_inventory, config, '', inventory_url)
+        fetch_func = functools.partial(intersphinx.fetch_inventory, SPHINX_MOCK_APP, '', inventory_url)
         for retry in range(1, FAILED_REQUEST_RETRY_AMOUNT+1):
             try:
                 package = await self.bot.loop.run_in_executor(None, fetch_func)
diff --git a/bot/cogs/metrics.py b/bot/cogs/metrics.py
new file mode 100644
index 000000000..47c3cc55e
--- /dev/null
+++ b/bot/cogs/metrics.py
@@ -0,0 +1,98 @@
+from collections import defaultdict
+
+from discord import Member, Message
+from discord.ext.commands import Cog, Context
+from prometheus_client import Counter, Gauge
+
+from bot.bot import Bot
+
+
+class Metrics(Cog):
+    """
+    Exports metrics for Prometheus.
+
+    See https://github.com/prometheus/client_python for metric documentation.
+    """
+
+    PREFIX = 'pydis_bot'
+
+    def __init__(self, bot: Bot) -> None:
+        self.bot = bot
+
+        self.guild_members = Gauge(
+            name=f'{self.PREFIX}_guild_members',
+            documentation="Total members by guild by status.",
+            labelnames=('guild_id', 'status')
+        )
+        self.guild_messages = Counter(
+            name=f'{self.PREFIX}_guild_messages',
+            documentation="Guild messages by guild by channel.",
+            labelnames=('channel_id', 'guild_id', 'channel_name')
+        )
+        self.command_completions = Counter(
+            name=f'{self.PREFIX}_command_completions',
+            documentation="Completed commands by command, user, and guild.",
+            labelnames=('guild_id', 'user_id', 'user_name', 'command')
+        )
+
+    @Cog.listener()
+    async def on_ready(self) -> None:
+        """Initialize the guild member counter."""
+        members_by_status = defaultdict(lambda: defaultdict(int))
+
+        for guild in self.bot.guilds:
+            if guild.large:
+                await self.bot.request_offline_members(guild)
+            for member in guild.members:
+                members_by_status[guild.id][member.status] += 1
+
+        for guild_id, members in members_by_status.items():
+            for status, count in members.items():
+                self.guild_members.labels(guild_id=guild_id, status=str(status)).set(count)
+
+    @Cog.listener()
+    async def on_member_join(self, member: Member) -> None:
+        """Increment the member gauge."""
+        self.guild_members.labels(guild_id=member.guild.id, status=str(member.status)).inc()
+
+    @Cog.listener()
+    async def on_member_leave(self, member: Member) -> None:
+        """Decrement the member gauge."""
+        self.guild_members.labels(guild_id=member.guild.id, status=str(member.status)).dec()
+
+    @Cog.listener()
+    async def on_member_update(self, before: Member, after: Member) -> None:
+        """Update member gauges for the new and old status if applicable."""
+        if before.status is not after.status:
+            self.guild_members.labels(guild_id=after.guild.id, status=str(before.status)).dec()
+            self.guild_members.labels(guild_id=after.guild.id, status=str(after.status)).inc()
+
+    @Cog.listener()
+    async def on_message(self, message: Message) -> None:
+        """Increment the guild message counter."""
+        self.guild_messages.labels(
+            channel_id=message.channel.id,
+            channel_name=message.channel.name,
+            guild_id=message.guild.id,
+        ).inc()
+
+    @Cog.listener()
+    async def on_command_completion(self, ctx: Context) -> None:
+        """Increment the command completion counter."""
+        if ctx.message.guild is not None:
+            if ctx.command.full_parent_name:
+                command = f'{ctx.command.full_parent_name} {ctx.command.name}'
+            else:
+                command = ctx.command.name
+
+            self.command_completions.labels(
+                guild_id=ctx.message.guild.id,
+                user_id=ctx.author.id,
+                user_name=str(ctx.author),
+                command=command,
+            ).inc()
+
+
+def setup(bot: Bot) -> None:
+    """Load the Metrics cog."""
+    bot.add_cog(Metrics(bot))
diff --git a/bot/cogs/moderation/infractions.py b/bot/cogs/moderation/infractions.py
index f4159adb9..f4e296df9 100644
--- a/bot/cogs/moderation/infractions.py
+++ b/bot/cogs/moderation/infractions.py
@@ -202,7 +202,7 @@ class Infractions(InfractionScheduler, commands.Cog):
         if await utils.has_active_infraction(ctx, user, "mute"):
             return
 
-        infraction = await utils.post_infraction(ctx, user, "mute", reason, **kwargs)
+        infraction = await utils.post_infraction(ctx, user, "mute", reason, active=True, **kwargs)
         if infraction is None:
             return
 
@@ -219,7 +219,7 @@ class Infractions(InfractionScheduler, commands.Cog):
     @respect_role_hierarchy()
     async def apply_kick(self, ctx: Context, user: Member, reason: str, **kwargs) -> None:
         """Apply a kick infraction with kwargs passed to `post_infraction`."""
-        infraction = await utils.post_infraction(ctx, user, "kick", reason, **kwargs)
+        infraction = await utils.post_infraction(ctx, user, "kick", reason, active=False, **kwargs)
         if infraction is None:
             return
 
@@ -234,7 +234,7 @@ class Infractions(InfractionScheduler, commands.Cog):
         if await utils.has_active_infraction(ctx, user, "ban"):
             return
 
-        infraction = await utils.post_infraction(ctx, user, "ban", reason, **kwargs)
+        infraction = await utils.post_infraction(ctx, user, "ban", reason, active=True, **kwargs)
         if infraction is None:
             return
 
diff --git a/bot/cogs/moderation/modlog.py b/bot/cogs/moderation/modlog.py
index 1e031443c..c78eb24a7 100644
--- a/bot/cogs/moderation/modlog.py
+++ b/bot/cogs/moderation/modlog.py
@@ -25,6 +25,12 @@ CHANNEL_CHANGES_SUPPRESSED = ("_overwrites", "position")
 MEMBER_CHANGES_SUPPRESSED = ("status", "activities", "_client_status", "nick")
 ROLE_CHANGES_UNSUPPORTED = ("colour", "permissions")
 
+VOICE_STATE_ATTRIBUTES = {
+    "channel.name": "Channel",
+    "self_stream": "Streaming",
+    "self_video": "Broadcasting",
+}
+
 
 class ModLog(Cog, name="ModLog"):
     """Logging for server events and staff actions."""
@@ -205,7 +211,7 @@ class ModLog(Cog, name="ModLog"):
                 new = value["new_value"]
                 old = value["old_value"]
 
-                changes.append(f"**{key.title()}:** `{old}` **->** `{new}`")
+                changes.append(f"**{key.title()}:** `{old}` **→** `{new}`")
 
             done.append(key)
 
@@ -283,7 +289,7 @@ class ModLog(Cog, name="ModLog"):
                 new = value["new_value"]
                 old = value["old_value"]
 
-                changes.append(f"**{key.title()}:** `{old}` **->** `{new}`")
+                changes.append(f"**{key.title()}:** `{old}` **→** `{new}`")
 
             done.append(key)
 
@@ -333,7 +339,7 @@ class ModLog(Cog, name="ModLog"):
             new = value["new_value"]
             old = value["old_value"]
 
-            changes.append(f"**{key.title()}:** `{old}` **->** `{new}`")
+            changes.append(f"**{key.title()}:** `{old}` **→** `{new}`")
 
             done.append(key)
 
@@ -486,23 +492,23 @@ class ModLog(Cog, name="ModLog"):
                 old = value.get("old_value")
 
                 if new and old:
-                    changes.append(f"**{key.title()}:** `{old}` **->** `{new}`")
+                    changes.append(f"**{key.title()}:** `{old}` **→** `{new}`")
 
             done.append(key)
 
         if before.name != after.name:
             changes.append(
-                f"**Username:** `{before.name}` **->** `{after.name}`"
+                f"**Username:** `{before.name}` **→** `{after.name}`"
             )
 
         if before.discriminator != after.discriminator:
             changes.append(
-                f"**Discriminator:** `{before.discriminator}` **->** `{after.discriminator}`"
+                f"**Discriminator:** `{before.discriminator}` **→** `{after.discriminator}`"
             )
 
         if before.display_name != after.display_name:
             changes.append(
-                f"**Display name:** `{before.display_name}` **->** `{after.display_name}`"
+                f"**Display name:** `{before.display_name}` **→** `{after.display_name}`"
             )
 
         if not changes:
@@ -748,3 +754,76 @@ class ModLog(Cog, name="ModLog"):
             Icons.message_edit, Colour.blurple(), "Message edited (After)",
             after_response, channel_id=Channels.message_log
         )
+
+    @Cog.listener()
+    async def on_voice_state_update(
+        self,
+        member: discord.Member,
+        before: discord.VoiceState,
+        after: discord.VoiceState
+    ) -> None:
+        """Log member voice state changes to the voice log channel."""
+        if (
+            member.guild.id != GuildConstant.id
+            or (before.channel and before.channel.id in GuildConstant.ignored)
+        ):
+            return
+
+        if member.id in self._ignored[Event.voice_state_update]:
+            self._ignored[Event.voice_state_update].remove(member.id)
+            return
+
+        # Exclude all channel attributes except the name.
+        diff = DeepDiff(
+            before,
+            after,
+            exclude_paths=("root.session_id", "root.afk"),
+            exclude_regex_paths=r"root\.channel\.(?!name)",
+        )
+
+        # A type change seems to always take precedent over a value change. Furthermore, it will
+        # include the value change along with the type change anyway. Therefore, it's OK to
+        # "overwrite" values_changed; in practice there will never even be anything to overwrite.
+        diff_values = {**diff.get("values_changed", {}), **diff.get("type_changes", {})}
+
+        icon = Icons.voice_state_blue
+        colour = Colour.blurple()
+        changes = []
+
+        for attr, values in diff_values.items():
+            if not attr:  # Not sure why, but it happens.
+                continue
+
+            old = values["old_value"]
+            new = values["new_value"]
+
+            attr = attr[5:]  # Remove "root." prefix.
+            attr = VOICE_STATE_ATTRIBUTES.get(attr, attr.replace("_", " ").capitalize())
+
+            changes.append(f"**{attr}:** `{old}` **→** `{new}`")
+
+            # Set the embed icon and colour depending on which attribute changed.
+            if any(name in attr for name in ("Channel", "deaf", "mute")):
+                if new is None or new is True:
+                    # Left a channel or was muted/deafened.
+                    icon = Icons.voice_state_red
+                    colour = Colours.soft_red
+                elif old is None or old is True:
+                    # Joined a channel or was unmuted/undeafened.
+                    icon = Icons.voice_state_green
+                    colour = Colours.soft_green
+
+        if not changes:
+            return
+
+        message = "\n".join(f"{Emojis.bullet} {item}" for item in sorted(changes))
+        message = f"**{member}** (`{member.id}`)\n{message}"
+
+        await self.send_log_message(
+            icon_url=icon,
+            colour=colour,
+            title="Voice state updated",
+            text=message,
+            thumbnail=member.avatar_url_as(static_format="png"),
+            channel_id=Channels.voice_log
+        )
diff --git a/bot/cogs/moderation/superstarify.py b/bot/cogs/moderation/superstarify.py
index be1e7b2d9..050c847ac 100644
--- a/bot/cogs/moderation/superstarify.py
+++ b/bot/cogs/moderation/superstarify.py
@@ -134,7 +134,7 @@ class Superstarify(InfractionScheduler, Cog):
 
         # Post the infraction to the API
         reason = reason or f"old nick: {member.display_name}"
-        infraction = await utils.post_infraction(ctx, member, "superstar", reason, duration)
+        infraction = await utils.post_infraction(ctx, member, "superstar", reason, duration, active=True)
         id_ = infraction["id"]
 
         old_nick = member.display_name
diff --git a/bot/cogs/utils.py b/bot/cogs/utils.py
index 47a59db66..da278011a 100644
--- a/bot/cogs/utils.py
+++ b/bot/cogs/utils.py
@@ -62,14 +62,12 @@ class Utils(Cog):
                 pep_embed.set_thumbnail(url="https://www.python.org/static/opengraph-icon-200x200.png")
 
                 # Add the interesting information
-                if "Status" in pep_header:
-                    pep_embed.add_field(name="Status", value=pep_header["Status"])
-                if "Python-Version" in pep_header:
-                    pep_embed.add_field(name="Python-Version", value=pep_header["Python-Version"])
-                if "Created" in pep_header:
-                    pep_embed.add_field(name="Created", value=pep_header["Created"])
-                if "Type" in pep_header:
-                    pep_embed.add_field(name="Type", value=pep_header["Type"])
+                fields_to_check = ("Status", "Python-Version", "Created", "Type")
+                for field in fields_to_check:
+                    # Check for a PEP metadata field that is present but has an empty value
+                    # embed field values can't contain an empty string
+                    if pep_header.get(field, ""):
+                        pep_embed.add_field(name=field, value=pep_header[field])
 
             elif response.status != 404:
                 # any response except 200 and 404 is expected
diff --git a/bot/cogs/watchchannels/bigbrother.py b/bot/cogs/watchchannels/bigbrother.py
index 41f933247..c601e0d4d 100644
--- a/bot/cogs/watchchannels/bigbrother.py
+++ b/bot/cogs/watchchannels/bigbrother.py
@@ -61,10 +61,10 @@ class BigBrother(WatchChannel, Cog, name="Big Brother"):
             return
 
         if user.id in self.watched_users:
-            await ctx.send(":x: The specified user is already being watched.")
+            await ctx.send(f":x: {user} is already being watched.")
             return
 
-        response = await post_infraction(ctx, user, 'watch', reason, hidden=True)
+        response = await post_infraction(ctx, user, 'watch', reason, hidden=True, active=True)
 
         if response is not None:
             self.watched_users[user.id] = response
diff --git a/bot/cogs/watchchannels/talentpool.py b/bot/cogs/watchchannels/talentpool.py
index 329a78af4..ad0c51fa6 100644
--- a/bot/cogs/watchchannels/talentpool.py
+++ b/bot/cogs/watchchannels/talentpool.py
@@ -69,7 +69,7 @@ class TalentPool(WatchChannel, Cog, name="Talentpool"):
             return
 
         if user.id in self.watched_users:
-            await ctx.send(":x: The specified user is already being watched in the talent pool")
+            await ctx.send(f":x: {user} is already being watched in the talent pool")
             return
 
         # Manual request with `raise_for_status` as False because we want the actual response
diff --git a/bot/constants.py b/bot/constants.py
index 2c0e3b10b..25c7856ba 100644
--- a/bot/constants.py
+++ b/bot/constants.py
@@ -333,6 +333,10 @@ class Icons(metaclass=YAMLGetter):
     superstarify: str
     unsuperstarify: str
 
+    voice_state_blue: str
+    voice_state_green: str
+    voice_state_red: str
+
 
 class CleanMessages(metaclass=YAMLGetter):
     section = "bot"
@@ -387,6 +391,7 @@ class Channels(metaclass=YAMLGetter):
     userlog: int
     user_event_a: int
     verification: int
+    voice_log: int
 
 
 class Webhooks(metaclass=YAMLGetter):
@@ -553,6 +558,8 @@ class Event(Enum):
     message_delete = "message_delete"
     message_edit = "message_edit"
 
+    voice_state_update = "voice_state_update"
+
 
 # Debug mode
 DEBUG_MODE = True if 'local' in os.environ.get("SITE_URL", "local") else False
diff --git a/bot/rules/attachments.py b/bot/rules/attachments.py
index c550aed76..00bb2a949 100644
--- a/bot/rules/attachments.py
+++ b/bot/rules/attachments.py
@@ -7,14 +7,14 @@ async def apply(
     last_message: Message, recent_messages: List[Message], config: Dict[str, int]
 ) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:
     """Detects total attachments exceeding the limit sent by a single user."""
-    relevant_messages = [last_message] + [
+    relevant_messages = tuple(
         msg
         for msg in recent_messages
         if (
             msg.author == last_message.author
             and len(msg.attachments) > 0
         )
-    ]
+    )
     total_recent_attachments = sum(len(msg.attachments) for msg in relevant_messages)
 
     if total_recent_attachments > config['max']:
diff --git a/config-default.yml b/config-default.yml
index c64430336..f842cf606 100644
--- a/config-default.yml
+++ b/config-default.yml
@@ -100,6 +100,10 @@ style:
         superstarify: "https://cdn.discordapp.com/emojis/636288153044516874.png"
         unsuperstarify: "https://cdn.discordapp.com/emojis/636288201258172446.png"
 
+        voice_state_blue: "https://cdn.discordapp.com/emojis/656899769662439456.png"
+        voice_state_green: "https://cdn.discordapp.com/emojis/656899770094452754.png"
+        voice_state_red: "https://cdn.discordapp.com/emojis/656899769905709076.png"
+
 guild:
     id: 267624335836053506
 
@@ -109,6 +113,7 @@ guild:
     channels:
         admins:            &ADMINS        365960823622991872
         admin_spam:        &ADMIN_SPAM    563594791770914816
+        admins_voice:      &ADMINS_VOICE  500734494840717332
         announcements:                    354619224620138496
         big_brother_logs:  &BBLOGS        468507907357409333
         bot:                              267659945086812160
@@ -139,13 +144,15 @@ guild:
         python:                           267624335836053506
         reddit:                           458224812528238616
         staff_lounge:      &STAFF_LOUNGE  464905259261755392
+        staff_voice:       &STAFF_VOICE   412375055910043655
         talent_pool:       &TALENT_POOL   534321732593647616
         userlog:                          528976905546760203
         user_event_a:      &USER_EVENT_A  592000283102674944
         verification:                     352442727016693763
+        voice_log:                        640292421988646961
 
     staff_channels: [*ADMINS, *ADMIN_SPAM, *MOD_SPAM, *MODS, *HELPERS, *ORGANISATION, *DEFCON]
-    ignored: [*ADMINS, *MESSAGE_LOG, *MODLOG]
+    ignored: [*ADMINS, *MESSAGE_LOG, *MODLOG, *ADMINS_VOICE, *STAFF_VOICE]
 
     roles:
         admin:             &ADMIN_ROLE      267628507062992896
@@ -154,7 +161,7 @@ guild:
         contributor:                        295488872404484098
         core_developer:                     587606783669829632
         helpers:                            267630620367257601
-        jammer:                             423054537079783434
+        jammer:                             591786436651646989
         moderator:         &MOD_ROLE        267629731250176001
         muted:             &MUTED_ROLE      277914926603829249
         owner:             &OWNER_ROLE      267627879762755584
@@ -201,6 +208,12 @@ filter:
         - 544525886180032552  # kennethreitz.org
         - 590806733924859943  # Discord Hack Week
         - 423249981340778496  # Kivy
+        - 197038439483310086  # Discord Testers
+        - 286633898581164032  # Ren'Py
+        - 349505959032389632  # PyGame
+        - 438622377094414346  # Pyglet
+        - 524691714909274162  # Panda3D
+        - 336642139381301249  # discord.py
 
     domain_blacklist:
         - pornhub.com
@@ -373,6 +386,9 @@ anti_malware:
         - '.ai'   # Illustrator
         - '.aep'  # After Effects
         - '.xcf'  # GIMP
+        - '.mp3'
+        - '.wav'
+        - '.ogg'
 
 
 reddit:
diff --git a/tests/bot/rules/test_attachments.py b/tests/bot/rules/test_attachments.py
index 4bb0acf7c..d7187f315 100644
--- a/tests/bot/rules/test_attachments.py
+++ b/tests/bot/rules/test_attachments.py
@@ -1,52 +1,98 @@
-import asyncio
 import unittest
-from dataclasses import dataclass
-from typing import Any, List
+from typing import List, NamedTuple, Tuple
 
 from bot.rules import attachments
+from tests.helpers import MockMessage, async_test
 
 
-# Using `MagicMock` sadly doesn't work for this usecase
-# since it's __eq__ compares the MagicMock's ID. We just
-# want to compare the actual attributes we set.
-@dataclass
-class FakeMessage:
-    author: str
-    attachments: List[Any]
+class Case(NamedTuple):
+    recent_messages: List[MockMessage]
+    culprit: Tuple[str]
+    total_attachments: int
 
 
-def msg(total_attachments: int) -> FakeMessage:
-    return FakeMessage(author='lemon', attachments=list(range(total_attachments)))
+def msg(author: str, total_attachments: int) -> MockMessage:
+    """Builds a message with `total_attachments` attachments."""
+    return MockMessage(author=author, attachments=list(range(total_attachments)))
 
 
 class AttachmentRuleTests(unittest.TestCase):
-    """Tests applying the `attachment` antispam rule."""
+    """Tests applying the `attachments` antispam rule."""
 
-    def test_allows_messages_without_too_many_attachments(self):
+    def setUp(self):
+        self.config = {"max": 5}
+
+    @async_test
+    async def test_allows_messages_without_too_many_attachments(self):
         """Messages without too many attachments are allowed as-is."""
         cases = (
-            (msg(0), msg(0), msg(0)),
-            (msg(2), msg(2)),
-            (msg(0),),
+            [msg("bob", 0), msg("bob", 0), msg("bob", 0)],
+            [msg("bob", 2), msg("bob", 2)],
+            [msg("bob", 2), msg("alice", 2), msg("bob", 2)],
         )
 
-        for last_message, *recent_messages in cases:
-            with self.subTest(last_message=last_message, recent_messages=recent_messages):
-                coro = attachments.apply(last_message, recent_messages, {'max': 5})
-                self.assertIsNone(asyncio.run(coro))
+        for recent_messages in cases:
+            last_message = recent_messages[0]
+
+            with self.subTest(
+                last_message=last_message,
+                recent_messages=recent_messages,
+                config=self.config
+            ):
+                self.assertIsNone(
+                    await attachments.apply(last_message, recent_messages, self.config)
+                )
 
-    def test_disallows_messages_with_too_many_attachments(self):
+    @async_test
+    async def test_disallows_messages_with_too_many_attachments(self):
         """Messages with too many attachments trigger the rule."""
         cases = (
-            ((msg(4), msg(0), msg(6)), [msg(4), msg(6)], 10),
-            ((msg(6),), [msg(6)], 6),
-            ((msg(1),) * 6, [msg(1)] * 6, 6),
+            Case(
+                [msg("bob", 4), msg("bob", 0), msg("bob", 6)],
+                ("bob",),
+                10
+            ),
+            Case(
+                [msg("bob", 4), msg("alice", 6), msg("bob", 2)],
+                ("bob",),
+                6
+            ),
+            Case(
+                [msg("alice", 6)],
+                ("alice",),
+                6
+            ),
+            (
+                [msg("alice", 1) for _ in range(6)],
+                ("alice",),
+                6
+            ),
         )
-        for messages, relevant_messages, total in cases:
-            with self.subTest(messages=messages, relevant_messages=relevant_messages, total=total):
-                last_message, *recent_messages = messages
-                coro = attachments.apply(last_message, recent_messages, {'max': 5})
-                self.assertEqual(
-                    asyncio.run(coro),
-                    (f"sent {total} attachments in 5s", ('lemon',), relevant_messages)
+
+        for recent_messages, culprit, total_attachments in cases:
+            last_message = recent_messages[0]
+            relevant_messages = tuple(
+                msg
+                for msg in recent_messages
+                if (
+                    msg.author == last_message.author
+                    and len(msg.attachments) > 0
+                )
+            )
+
+            with self.subTest(
+                last_message=last_message,
+                recent_messages=recent_messages,
+                relevant_messages=relevant_messages,
+                total_attachments=total_attachments,
+                config=self.config
+            ):
+                desired_output = (
+                    f"sent {total_attachments} attachments in {self.config['max']}s",
+                    culprit,
+                    relevant_messages
+                )
+                self.assertTupleEqual(
+                    await attachments.apply(last_message, recent_messages, self.config),
+                    desired_output
                 )
diff --git a/tests/bot/rules/test_links.py b/tests/bot/rules/test_links.py
index be832843b..02a5d5501 100644
--- a/tests/bot/rules/test_links.py
+++ b/tests/bot/rules/test_links.py
@@ -2,25 +2,19 @@ import unittest
 from typing import List, NamedTuple, Tuple
 
 from bot.rules import links
-from tests.helpers import async_test
-
-
-class FakeMessage(NamedTuple):
-    author: str
-    content: str
+from tests.helpers import MockMessage, async_test
 
 
 class Case(NamedTuple):
-    recent_messages: List[FakeMessage]
-    relevant_messages: Tuple[FakeMessage]
+    recent_messages: List[MockMessage]
     culprit: Tuple[str]
     total_links: int
 
 
-def msg(author: str, total_links: int) -> FakeMessage:
-    """Makes a message with *total_links* links."""
+def msg(author: str, total_links: int) -> MockMessage:
+    """Makes a message with `total_links` links."""
     content = " ".join(["https://pydis.com"] * total_links)
-    return FakeMessage(author=author, content=content)
+    return MockMessage(author=author, content=content)
 
 
 class LinksTests(unittest.TestCase):
@@ -61,26 +55,28 @@ class LinksTests(unittest.TestCase):
         cases = (
             Case(
                 [msg("bob", 1), msg("bob", 2)],
-                (msg("bob", 1), msg("bob", 2)),
                 ("bob",),
                 3
             ),
             Case(
                 [msg("alice", 1), msg("alice", 1), msg("alice", 1)],
-                (msg("alice", 1), msg("alice", 1), msg("alice", 1)),
                 ("alice",),
                 3
             ),
             Case(
                 [msg("alice", 2), msg("bob", 3), msg("alice", 1)],
-                (msg("alice", 2), msg("alice", 1)),
                 ("alice",),
                 3
             )
         )
 
-        for recent_messages, relevant_messages, culprit, total_links in cases:
+        for recent_messages, culprit, total_links in cases:
             last_message = recent_messages[0]
+            relevant_messages = tuple(
+                msg
+                for msg in recent_messages
+                if msg.author == last_message.author
+            )
 
             with self.subTest(
                 last_message=last_message,
diff --git a/tests/bot/rules/test_mentions.py b/tests/bot/rules/test_mentions.py
new file mode 100644
index 000000000..ad49ead32
--- /dev/null
+++ b/tests/bot/rules/test_mentions.py
@@ -0,0 +1,95 @@
+import unittest
+from typing import List, NamedTuple, Tuple
+
+from bot.rules import mentions
+from tests.helpers import MockMessage, async_test
+
+
+class Case(NamedTuple):
+    recent_messages: List[MockMessage]
+    culprit: Tuple[str]
+    total_mentions: int
+
+
+def msg(author: str, total_mentions: int) -> MockMessage:
+    """Makes a message with `total_mentions` mentions."""
+    return MockMessage(author=author, mentions=list(range(total_mentions)))
+
+
+class TestMentions(unittest.TestCase):
+    """Tests applying the `mentions` antispam rule."""
+
+    def setUp(self):
+        self.config = {
+            "max": 2,
+            "interval": 10
+        }
+
+    @async_test
+    async def test_mentions_within_limit(self):
+        """Messages with an allowed amount of mentions."""
+        cases = (
+            [msg("bob", 0)],
+            [msg("bob", 2)],
+            [msg("bob", 1), msg("bob", 1)],
+            [msg("bob", 1), msg("alice", 2)]
+        )
+
+        for recent_messages in cases:
+            last_message = recent_messages[0]
+
+            with self.subTest(
+                last_message=last_message,
+                recent_messages=recent_messages,
+                config=self.config
+            ):
+                self.assertIsNone(
+                    await mentions.apply(last_message, recent_messages, self.config)
+                )
+
+    @async_test
+    async def test_mentions_exceeding_limit(self):
+        """Messages with a higher than allowed amount of mentions."""
+        cases = (
+            Case(
+                [msg("bob", 3)],
+                ("bob",),
+                3
+            ),
+            Case(
+                [msg("alice", 2), msg("alice", 0), msg("alice", 1)],
+                ("alice",),
+                3
+            ),
+            Case(
+                [msg("bob", 2), msg("alice", 3), msg("bob", 2)],
+                ("bob",),
+                4
+            )
+        )
+
+        for recent_messages, culprit, total_mentions in cases:
+            last_message = recent_messages[0]
+            relevant_messages = tuple(
+                msg
+                for msg in recent_messages
+                if msg.author == last_message.author
+            )
+
+            with self.subTest(
+                last_message=last_message,
+                recent_messages=recent_messages,
+                relevant_messages=relevant_messages,
+                culprit=culprit,
+                total_mentions=total_mentions,
+                cofig=self.config
+            ):
+                desired_output = (
+                    f"sent {total_mentions} mentions in {self.config['interval']}s",
+                    culprit,
+                    relevant_messages
+                )
+                self.assertTupleEqual(
+                    await mentions.apply(last_message, recent_messages, self.config),
+                    desired_output
+                )