doc: add more stuff to release overview (#3386)

Add failover www server and unofficial-build servers.
Add relationships for Cloudflare CDN.
Use appropriate symbols for manual processes and storage.

Refs: #3377 (comment)

Author: richardlau

doc/release-overview.md

@@ -1,31 +1,33 @@
 # Overview of release process and infrastructure for Node.js
 
-This is an overview of how the release process for Node.js works and how it interacts with Build WG infrastructure.
+This is an overview of infrastructure owned/managed by the Build WG and how it interacts with Node.js' [release process][].
+
 Clicking on most labels will take you to the relevant area of the build repository or other repository owned by the Node.js organization.
 
 ```mermaid
 flowchart TD
-    subgraph user[Releaser]
+    subgraph releaser[Releaser]
       start([<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md'>Start</a>])
-      prepareRelease(<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#7-ensure-that-the-release-branch-is-stable'>Prepare the release</a>)
-      startTestBuilds(<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#7-ensure-that-the-release-branch-is-stable'>Start test builds</a>)
+      prepareRelease[/<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#7-ensure-that-the-release-branch-is-stable'>Prepare the release</a>\]
+      startTestBuilds[/<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#7-ensure-that-the-release-branch-is-stable'>Start test builds</a>\]
       readyToRelease{Ready for release?}
       
-      startReleaseBuilds(<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#9-produce-release-builds'>Start release build</a>)
-      promote(<a href='https://github.com/nodejs/node/blob/main/tools/release.sh'>Promote</a>)
-      blog(<a href='https://github.com/nodejs/nodejs.org/blob/main/scripts/release-post/index.mjs'>Create blog post</a>)
+      startReleaseBuilds[/<a href='https://github.com/nodejs/node/blob/main/doc/contributing/releases.md#9-produce-release-builds'>Start release build</a>\]
+      promote[/<a href='https://github.com/nodejs/node/blob/main/tools/release.sh'>Promote</a>\]
+      blog[/<a href='https://github.com/nodejs/nodejs.org/blob/main/scripts/release-post/index.mjs'>Create blog post</a>\]
       done([End])
 
       start-->prepareRelease-->startTestBuilds-->readyToRelease
       readyToRelease--No-->prepareRelease
       readyToRelease--Yes-->startReleaseBuilds-->promote-->blog-->done
     end
     subgraph github[GitHub]
-      ghCode[<a href='https://github.com/nodejs/node'>nodejs/node</a>]
-      ghWebsite[<a href='https://github.com/nodejs/nodejs.org'>nodejs/nodejs.org</a>]
+      ghCode[(<a href='https://github.com/nodejs/node'>nodejs/node</a>)]
+      ghWebsite[(<a href='https://github.com/nodejs/nodejs.org'>nodejs/nodejs.org</a>)]
+      ghUnofficial[(<a href='https://github.com/nodejs/unofficial-builds'>nodejs/unofficial-builds</a>)]
       
-      %% This invisible link is to aid the layout of the flowchart, stacking the two repositories vertically
-      ghCode ~~~ ghWebsite
+      %% This invisible link is to aid the layout of the flowchart, stacking the repositories vertically
+      ghCode ~~~ ghWebsite ~~~ ghUnofficial
     end
     subgraph buildInfra[Infrastructure owned by Build WG]
     subgraph ci[Test CI]
@@ -34,16 +36,21 @@ flowchart TD
     subgraph ci-release[Release CI]
       releaseBuilds(<a href='https://ci-release.nodejs.org/job/iojs+release/'>Release builds</a>)
     end
-    subgraph www[www server]
+    subgraph wwwServer[<a href='https://github.com/nodejs/build/tree/main/ansible/www-standalone'>www server</a>]
       staging[(staging)]
       promotion(<a href='https://github.com/nodejs/build/tree/main/ansible/www-standalone/tools/promote'>Promotion</a>)
       dist[(dist)]
       rebuildIdx(<a href='https://github.com/nodejs/nodejs-dist-indexer'>Rebuild index</a>)
       rebuildWebsite(<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/resources/scripts/build-site.sh'>Rebuild website</a>)
+      www[(www)]
       queueCDN[<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/resources/scripts/queue-cdn-purge.sh'>Queue CDN purge</a>]
       webhook(<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/resources/config/github-webhook.json.j2'>Webhook</a>)
+      subgraph nightlyCron[<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/tasks/tools.yaml'>nightly cron</a>]
+        nightlyBuilder[[<a href='https://github.com/nodejs/nodejs-nightly-builder'>nodejs-nightly-builder</a>]]
+      end
 
       staging-->promotion-->dist-->rebuildIdx
+      nightlyBuilder-.->releaseBuilds
 
       subgraph chkIndex[Check index]
         idxChanged{<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/resources/scripts/check-build-site.sh'>Index Changed?</a>}
@@ -54,7 +61,7 @@ flowchart TD
       rebuildIdx-.->idxChanged
       webhook-->rebuildWebsite
       idxChanged--Yes-->rebuildWebsite
-      rebuildWebsite-->queueCDN-.->purgeQueued
+      rebuildWebsite-->www-->queueCDN-.->purgeQueued
 
       subgraph cdn[CDN purge queue]
         purgeQueued{<a href='https://github.com/nodejs/build/blob/main/ansible/www-standalone/resources/scripts/cdn-purge.sh.j2'>CDN purge queued?</a>}
@@ -64,6 +71,35 @@ flowchart TD
         purgeQueued--Yes-->purge
       end
     end
+    subgraph unofficial[<a href='https://github.com/nodejs/build/tree/main/ansible/roles/unofficial-builds'>Unofficial builds server</a>]
+      subgraph unofficialPeriodicTimer[<a href='https://github.com/nodejs/build/blob/main/ansible/roles/unofficial-builds/files/nodejs-periodic.timer'>nodejs-periodic.timer</a>]
+        subgraph unofficialPeriodicService[<a href='https://github.com/nodejs/build/blob/main/ansible/roles/unofficial-builds/files/nodejs-periodic.service'>nodejs-periodic.service</a>]
+          unofficialPeriodicSh[[<a href='https://github.com/nodejs/unofficial-builds/blob/main/bin/periodic.sh'>periodic.sh</a>]]
+          unofficialBuildIfQueued[[<a href='https://github.com/nodejs/unofficial-builds/blob/main/bin/build-if-queued.sh'>build-if-queued.sh</a>]]
+        end
+      end
+      unofficialManualQueue[/<a href='https://github.com/nodejs/unofficial-builds#manual-build-triggers'>Manually queue build</a>\]
+      unofficialQueueBuild[<a href='https://github.com/nodejs/unofficial-builds/blob/main/bin/queue-push.sh'>Queue build</a>]
+      unofficialDownloads[(download)]
+      unofficialWebhook[<a href='https://github.com/nodejs/build/blob/main/ansible/roles/unofficial-builds/files/unofficial-builds-deploy-webhook.service'>Webhook</a>]
+      unofficialDeploy[<a href='https://github.com/nodejs/build/blob/main/ansible/roles/unofficial-builds/files/deploy-unofficial-builds.sh'>Deploy recipes]
+      unofficialRecipes[(Recipe containers)]
+      
+      ghUnofficial-.->|Pull request merged|unofficialWebhook-->unofficialDeploy-->unofficialRecipes
+      unofficialPeriodicSh-->unofficialBuildIfQueued-->unofficialDownloads
+      unofficialPeriodicSh-->unofficialQueueBuild-->unofficialBuildIfQueued
+      unofficialManualQueue-->unofficialQueueBuild
+    end
+    subgraph unencrypted[www failover server]
+      unencryptedRsync[[rsyncmirror.service]]
+      unencryptedDist[(dist mirror)]
+      unencryptedWww[(www mirror)]
+
+      dist-->unencryptedRsync
+      www-->unencryptedRsync
+      unencryptedRsync-->unencryptedDist
+      unencryptedRsync-->unencryptedWww
+    end
     end
     prepareRelease-->|Open/update pull request|ghCode
     startTestBuilds-->testBuilds
@@ -72,8 +108,19 @@ flowchart TD
     promote-->promotion
     blog-->|Open pull request|ghWebsite
     releaseBuilds-->staging
-    purge-->cloudflare
+    subgraph cloudflare[Cloudflare]
+      cloudflareCDN[(CDN)]
+    end
+    purge-->cloudflareCDN
+    dist-.->cloudflareCDN
+    www-.->cloudflareCDN
+    unencryptedDist-.->cloudflareCDN
+    unencryptedWww-.->cloudflareCDN
 
-    %% This invisible link is to aid the layout of the flowchart, stacking the "Test CI" subgraph above the "Release CI" subgraph
-    ci ~~~ ci-release
+    %% Invisible links to aid the layout of the flowchart, vertically stacking some subgraphs
+    ci ~~~ ci-release ~~~ unofficial
+    unofficial ~~~ unencrypted
+    buildInfra ~~~ cloudflare
 ```
+
+[release process]: https://github.com/nodejs/node/blob/main/doc/contributing/releases.md