Use multiple hackney pools

* federation (ap, salmon)
* media (rich media, media proxy)
* upload (uploader proxy)

Each "part" will stop fighting others ones -- a huge federation outbound
could before make the media proxy fail to checkout a connection in time.

splitted media and uploaded media for the good reason than an upload
pool will have all connections to the same host (the uploader upstream).
it also has a longer default retention period for connections.

config/config.exs

@@ -15,6 +15,20 @@ config :pleroma, Pleroma.Captcha,
   seconds_valid: 60,
   method: Pleroma.Captcha.Kocaptcha
 
+config :pleroma, :hackney_pools,
+  federation: [
+    max_connections: 50,
+    timeout: 150_000
+  ],
+  media: [
+    max_connections: 50,
+    timeout: 150_000
+  ],
+  upload: [
+    max_connections: 25,
+    timeout: 300_000
+  ]
+
 config :pleroma, Pleroma.Captcha.Kocaptcha, endpoint: "https://captcha.kotobank.ch"
 
 # Upload configuration
@@ -22,7 +36,14 @@ config :pleroma, Pleroma.Upload,
   uploader: Pleroma.Uploaders.Local,
   filters: [],
   proxy_remote: false,
-  proxy_opts: []
+  proxy_opts: [
+    redirect_on_failure: false,
+    max_body_length: 25 * 1_048_576,
+    http: [
+      follow_redirect: true,
+      pool: :upload
+    ]
+  ]
 
 config :pleroma, Pleroma.Uploaders.Local, uploads: "uploads"
 
@@ -214,7 +235,16 @@ config :pleroma, :mrf_simple,
   reject: [],
   accept: []
 
-config :pleroma, :media_proxy, enabled: false
+config :pleroma, :media_proxy,
+  enabled: false,
+  proxy_opts: [
+    redirect_on_failure: false,
+    max_body_length: 25 * 1_048_576,
+    http: [
+      follow_redirect: true,
+      pool: :media
+    ]
+  ]
 
 config :pleroma, :chat, enabled: true