Document Unhealthy Geo status when Maintenance Mode is on

doc/administration/geo/disaster_recovery/planned_failover.md

@@ -162,6 +162,9 @@ be disabled on the **primary** site:
 
 ## Finish replicating and verifying all data
 
+NOTE:
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which the Geo secondary site statuses will appear to stop updating and become unhealthy. For more information, see [Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](../replication/troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 1. If you are manually replicating any data not managed by Geo, trigger the
    final replication process now.
 1. On the **primary** node:

doc/administration/geo/disaster_recovery/runbooks/planned_failover_multi_node.md

@@ -63,6 +63,9 @@ Before following any of those steps, make sure you have `root` access to the
 **secondary** to promote it, since there isn't provided an automated way to
 promote a Geo replica and perform a failover.
 
+NOTE:
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which the Geo secondary site statuses will appear to stop updating and become unhealthy. For more information, see [Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](../../replication/troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 On the **secondary** node:
 
 1. On the top bar, select **Menu > Admin**.

doc/administration/geo/disaster_recovery/runbooks/planned_failover_single_node.md

@@ -51,6 +51,9 @@ Before following any of those steps, make sure you have `root` access to the
 **secondary** to promote it, since there isn't provided an automated way to
 promote a Geo replica and perform a failover.
 
+NOTE:
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which the Geo secondary site statuses will appear to stop updating and become unhealthy. For more information, see [Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](../../replication/troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 On the **secondary** node, navigate to the **Admin Area > Geo** dashboard to
 review its status. Replicated objects (shown in green) should be close to 100%,
 and there should be no failures (shown in red). If a large proportion of

doc/administration/geo/replication/troubleshooting.md

@@ -83,7 +83,7 @@ Checking Geo ... Finished
 #### Sync status Rake task
 
 Current sync information can be found manually by running this Rake task on any
-**secondary** app node:
+node running Rails (Puma, Sidekiq, or Geo Log Cursor) on the Geo **secondary** site:
 
 ```shell
 sudo gitlab-rake geo:status
@@ -923,6 +923,14 @@ To resolve this issue:
 If using a load balancer, ensure that the load balancer's URL is set as the `external_url` in the
 `/etc/gitlab/gitlab.rb` of the nodes behind the load balancer.
 
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+In GitLab 13.9 through GitLab 14.3, when [GitLab Maintenance Mode](../../maintenance_mode/index.md) is enabled, the status of Geo secondary sites will stop getting updated. After 10 minutes, the status will become `Unhealthy`.
+
+Geo secondary sites will continue to replicate and verify data, and the secondary sites should still be usable. You can use the [Sync status Rake task](#sync-status-rake-task) to determine the actual status of a secondary site during Maintenance Mode.
+
+This bug was [fixed in GitLab 14.4](https://gitlab.com/gitlab-org/gitlab/-/issues/292983).
+
 ### GitLab Pages return 404 errors after promoting
 
 This is due to [Pages data not being managed by Geo](datatypes.md#limitations-on-replicationverification).

doc/administration/geo/replication/version_specific_updates.md

@@ -13,6 +13,8 @@ for updating Geo nodes.
 
 ## Updating to 14.1, 14.2, 14.3
 
+### Multi-arch images
+
 We found an [issue](https://gitlab.com/gitlab-org/gitlab/-/issues/336013) where the Container Registry replication wasn't fully working if you used multi-arch images. In case of a multi-arch image, only the primary architecture (for example `amd64`) would be replicated to the secondary node. This has been [fixed in GitLab 14.3](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67624) and was backported to 14.2 and 14.1, but manual steps are required to force a re-sync.
 
 You can check if you are affected by running:
@@ -46,18 +48,28 @@ Otherwise, on all your **secondary** nodes, in a [Rails console](../../operation
 
 If you are running a version prior to 14.1 and are using Geo and multi-arch containers in your Container Registry, we recommend [upgrading](updating_the_geo_sites.md) to at least GitLab 14.1.
 
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 ## Updating to GitLab 14.0/14.1
 
+### Primary sites can not be removed from the UI
+
 We found an issue where [Primary sites can not be removed from the UI](https://gitlab.com/gitlab-org/gitlab/-/issues/338231).
 
 This bug only exists in the UI and does not block the removal of Primary sites using any other method.
 
-### If you have already updated to an affected version and need to remove your Primary site
+If you are running an affected version and need to remove your Primary site, you can manually remove the Primary site by using the [Geo Nodes API](../../../api/geo_nodes.md#delete-a-geo-node).
 
-You can manually remove the Primary site by using the [Geo Nodes API](../../../api/geo_nodes.md#delete-a-geo-node).
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
 
 ## Updating to GitLab 13.12
 
+### Secondary nodes re-download all LFS files upon update
+
 We found an issue where [secondary nodes re-download all LFS files](https://gitlab.com/gitlab-org/gitlab/-/issues/334550) upon update. This bug:
 
 - Only applies to Geo secondary sites that have replicated LFS objects.
@@ -68,7 +80,7 @@ We found an issue where [secondary nodes re-download all LFS files](https://gitl
 If you don't have many LFS objects or can stand a bit of churn, then it is safe to let the secondary sites re-download LFS objects.
 If you do have many LFS objects, or many Geo secondary sites, or limited bandwidth, or a combination of them all, then we recommend you skip GitLab 13.12.0 through 13.12.6 and update to GitLab 13.12.7 or newer.
 
-### If you have already updated to an affected version, and the re-sync is ongoing
+#### If you have already updated to an affected version, and the re-sync is ongoing
 
 You can manually migrate the legacy sync state to the new state column by running the following command in a [Rails console](../../operations/rails_console.md). It should take under a minute:
 
@@ -76,15 +88,31 @@ You can manually migrate the legacy sync state to the new state column by runnin
 Geo::LfsObjectRegistry.where(state: 0, success: true).update_all(state: 2)
 ```
 
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 ## Updating to GitLab 13.11
 
 We found an [issue with Git clone/pull through HTTP(s)](https://gitlab.com/gitlab-org/gitlab/-/issues/330787) on Geo secondaries and on any GitLab instance if maintenance mode is enabled. This was caused by a regression in GitLab Workhorse. This is fixed in the [GitLab 13.11.4 patch release](https://about.gitlab.com/releases/2021/05/14/gitlab-13-11-4-released/). To avoid this issue, upgrade to GitLab 13.11.4 or later.
 
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
+## Updating to GitLab 13.10
+
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 ## Updating to GitLab 13.9
 
+### Error during zero-downtime update: "cannot drop column asset_proxy_whitelist"
+
 We've detected an issue [with a column rename](https://gitlab.com/gitlab-org/gitlab/-/issues/324160)
 that will prevent upgrades to GitLab 13.9.0, 13.9.1, 13.9.2 and 13.9.3 when following the zero-downtime steps. It is necessary
-to perform the following additional steps for the zero-downtime upgrade:
+to perform the following additional steps for the zero-downtime update:
 
 1. Before running the final `sudo gitlab-rake db:migrate` command on the deploy node,
    execute the following queries using the PostgreSQL console (or `sudo gitlab-psql`)
@@ -118,6 +146,10 @@ DETAIL: trigger trigger_0d588df444c8 on table application_settings depends on co
 To work around this bug, follow the previous steps to complete the update.
 More details are available [in this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/324160).
 
+### Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode
+
+GitLab 13.9 through GitLab 14.3 are affected by a bug in which enabling [GitLab Maintenance Mode](../../maintenance_mode/index.md) will cause Geo secondary site statuses to appear to stop updating and become unhealthy. For more information, see [Troubleshooting - Geo Admin Area shows 'Unhealthy' after enabling Maintenance Mode](troubleshooting.md#geo-admin-area-shows-unhealthy-after-enabling-maintenance-mode).
+
 ## Updating to GitLab 13.7
 
 We've detected an issue with the `FetchRemove` call used by Geo secondaries.