Add Praefect log location

doc/administration/gitaly/index.md

@@ -449,6 +449,8 @@ To monitor [strong consistency](#strong-consistency), you can use the following
 - `gitaly_hook_transaction_voting_delay_seconds`, the client-side delay introduced by waiting for
   the transaction to be committed.
 
+You can also monitor the [Praefect logs](../logs.md#praefect-logs).
+
 ## Do not bypass Gitaly
 
 GitLab doesn't advise directly accessing Gitaly repositories stored on disk with a Git client,

doc/administration/logs.md

@@ -50,6 +50,7 @@ except those captured by `runit`.
 | [Mailroom](#mail_room_jsonlog-default)          | **{check-circle}** Yes | **{check-circle}** Yes  |
 | [NGINX](#nginx-logs)                            | **{check-circle}** Yes | **{check-circle}** Yes  |
 | [PostgreSQL Logs](#postgresql-logs)             | **{dotted-circle}** No | **{check-circle}** Yes  |
+| [Praefect Logs](#praefect-logs)                 | **{dotted-circle}** Yes| **{check-circle}** Yes  |
 | [Prometheus Logs](#prometheus-logs)             | **{dotted-circle}** No | **{check-circle}** Yes  |
 | [Puma](#puma-logs)                              | **{check-circle}** Yes | **{check-circle}** Yes  |
 | [Redis Logs](#redis-logs)                       | **{dotted-circle}** No | **{check-circle}** Yes  |
@@ -1062,6 +1063,12 @@ For Omnibus GitLab installations, GitLab Exporter logs are in `/var/log/gitlab/g
 For Omnibus GitLab installations, GitLab Kubernetes Agent Server logs are
 in `/var/log/gitlab/gitlab-kas/`.
 
+## Praefect Logs
+
+For Omnibus GitLab installations, Praefect logs are in `/var/log/gitlab/praefect/`.
+
+GitLab also tracks [Prometheus metrics for Praefect](gitaly/#monitor-gitaly-cluster).
+
 ## Performance bar stats
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48149) in GitLab 13.7.