dotcom: clean up operational docs (#8779)

Wanted to address [this
feedback](https://sourcegraph.slack.com/archives/C04MYFW01NV/p1711482601481429),
but ended up in a bit of a rabbit hole. Years of dotcom changes,
ownership transfers, etc etc have left some pretty gnarly sprawl and
outdated docs - this PR doesn't fix everything, but just tries to fix
some things I saw today and some stuff that have bothered me for a
while. My dream is that one day, this is a Cloud instance, and
go/cloud-ops takes care of life for us.

1. Delete all Grafana Cloud and Loki references (except an old DevX
newsletter entry), this has been gone for at least a year now
2. Add a new `Logs` and `Metrics` section for Sourcegraph.com.
3. Added some more backlinks to dotcom observability, and the kubernetes
cheatsheet
4. Migrate the Postgres guide to the dotcom playbooks page. This has
annoyed me for a while -the two pages have similar but
not-quite-the-same content and the latter was a bit broken, this just
keeps things in one place. I'm not sure I'm a huge fan of a monolith
playbooks page because header uniqueness becomes hard, but it's better
than the sprawl we have right now. I didn't fully check everything 100%
works all the time starting from various setups, but at least this lives
in one place now, and we can follow up more easily.
5. Fix a whole lot of broken page links and anchor links (so many
renamed and deleted sections) with best-effort replacements.
6. Add a mention of the Cloudflare logs Elasticsearch instance because I
happen to know about it from
[this](https://docs.google.com/document/d/1tkCSCqcw5mdLRvdCzmVALPLFI0xIO9PXxC2_Se1YP5Q/edit)

Closes sourcegraph/devx-support#743

content/departments/engineering/dev/process/deployments/index.md

@@ -2,20 +2,19 @@
 
 For a complete list of Sourcegraph instances we manage, see our [instances documentation](instances.md).
 
-- [Deployments](#deployments)
-  - [Deployment basics](#deployment-basics)
-    - [Images](#images)
-    - [Renovate](#renovate)
-    - [ArgoCD](#argocd)
-    - [Infrastructure](#infrastructure)
-  - [deploy-sourcegraph](#deploy-sourcegraph)
-    - [Merging changes from deploy-sourcegraph](#merging-changes-from-deploy-sourcegraph)
-  - [Relationship between deploy-sourcegraph repositories](#relationship-between-deploy-sourcegraph-repositories)
-    - [Merging upstream `deploy-sourcegraph` into `deploy-sourcegraph` forks](#merging-upstream-deploy-sourcegraph-into-deploy-sourcegraph-forks)
-  - [Sourcegraph Cloud](#sourcegraph-cloud)
-    - [Continuous Deployment Process](#continuous-deployment-process)
-  - [Deployment observability](#deployment-observability)
-    - [Deployment traces](#deployment-traces)
+- [Deployment basics](#deployment-basics)
+  - [Images](#images)
+  - [Renovate](#renovate)
+  - [ArgoCD](#argocd)
+  - [Infrastructure](#infrastructure)
+- [deploy-sourcegraph](#deploy-sourcegraph)
+  - [Merging changes from deploy-sourcegraph](#merging-changes-from-deploy-sourcegraph)
+- [Relationship between deploy-sourcegraph repositories](#relationship-between-deploy-sourcegraph-repositories)
+  - [Merging upstream `deploy-sourcegraph` into `deploy-sourcegraph` forks](#merging-upstream-deploy-sourcegraph-into-deploy-sourcegraph-forks)
+- [DotCom](#dotcom)
+  - [Continuous Deployment Process](#continuous-deployment-process)
+- [Deployment observability](#deployment-observability)
+  - [Deployment traces](#deployment-traces)
 
 Additional resources:
 
@@ -37,7 +36,7 @@ Each Sourcegraph service is provided as a Docker image. Every commit to `main` i
 
 When [a new semver release](../releases/index.md) is cut the pipelines, will build a release image with the same tag as the latest [release version](https://github.com/sourcegraph/sourcegraph/tags) as well. These are used by customer deployments.
 
-For pushing custom images, refer to [building Docker images for specific branches](#building-docker-images-for-a-specific-branch).
+For pushing custom images, see `sg ci docs`.
 
 ### Renovate
 

content/departments/engineering/dev/process/deployments/instances.md

@@ -18,13 +18,15 @@ Also see [playbooks](./playbooks.md) for common actions related to operating our
 
 [![Build status](https://badge.buildkite.com/ef1289610fdd05b606bf1e57a034af2365c7b09c95ac6121f9.svg)](https://buildkite.com/sourcegraph/deploy-sourcegraph-cloud)
 
-This deployment is also colloquially referred to as 'DotCom' and 'sourcegraph.com'. It is the public deployment available to the public at [sourcegraph.com/search](https://sourcegraph.com/search).
+This deployment is also colloquially referred to as 'DotCom' and 'sourcegraph.com'.
+It is the public deployment available to the public at [sourcegraph.com/search](https://sourcegraph.com/search), and is currently operated by the [Core Services team](../../../teams/core-services/index.md).
 
 `sourcegraph.com` deploys the latest changes from [`sourcegraph/sourcegraph`](https://github.com/sourcegraph/sourcegraph) on a [daily basis](index.md#continuous-deployment-process).
 
-This deployment also includes our [documentation](https://docs.sourcegraph.com/) and [about](https://about.sourcegraph.com/) sites.
+This deployment **does not** include the [about](https://about.sourcegraph.com/) site and the [new documentation site at sourcegraph.com/docs](https://sourcegraph.com/docs).
+It currently still includes the legacy [docs.sourcegraph.com](https://docs.sourcegraph.com/) site, however.
 
-> 🐶 For dogfooding changes, use [k8s.sgdev.org](#k8ssgdevorg) instead, which generally receives updates faster.
+> [!NOTE] 🐶 For dogfooding changes, use [sourcegraph.sourcegraph.com](#sourcegraphsourcegraphcom-s2) instead, which generally receives updates faster.
 
 - [DotCom cluster on GCP](https://console.cloud.google.com/kubernetes/clusters/details/us-central1-f/cloud?project=sourcegraph-dev)
   ```
@@ -34,12 +36,14 @@ This deployment also includes our [documentation](https://docs.sourcegraph.com/)
 - [Infrastructure configuration](https://github.com/sourcegraph/infrastructure/tree/main/cloud)
 - Alerts: #alerts-cloud and [OpsGenie](../incidents/on_call.md)
 - [Playbooks](./playbooks.md#sourcegraphcom)
+- [Observability](../../tools/observability/dotcom.md)
+- [Domain routing rules](https://sourcegraph.sourcegraph.com/github.com/sourcegraph/infrastructure/-/blob/gfe/envs/prod/project/routes.tf)
 
 ## k8s.sgdev.org
 
 [![Build status](https://badge.buildkite.com/65c9b6f836db6d041ea29b05e7310ebb81fa36741c78f207ce.svg?branch=release)](https://buildkite.com/sourcegraph/deploy-sourcegraph-dogfood-k8s-2)
 
-**NO LONGER PRIMARY DOGFOODING INSTANCE, SEE [S2](#sourcegraphsourcegraphcom-s2) BELOW**
+> [!WARNING] **THIS IS NO LONGER PRIMARY DOGFOODING INSTANCE, SEE [S2](#sourcegraphsourcegraphcom-s2) BELOW**
 
 This deployment is also colloquially referred to as "dogfood", "dogfood-k8s", or just "k8s".
 This is the Sourcegraph instance to use for dogfooding changes to Sourcegraph.

content/departments/engineering/dev/process/deployments/kubernetes.md

@@ -1,4 +1,4 @@
-# Kubernetes
+# Working with Kubernetes deployments
 
 This section contains tips and advice for interacting with our Kubernetes deployments (most notably [sourcegraph.com](#sourcegraph-cloud) and [k8s.sgdev.org](#k8s-sgdev-org)).