Remove mentions of Sherlock from our docs

doc/development/index.md

@@ -264,8 +264,7 @@ the [reviewer values](https://about.gitlab.com/handbook/engineering/workflow/rev
 - [Caching guidelines](caching.md) for using caching in Rails under a GitLab environment.
 - [Merge request performance guidelines](merge_request_performance_guidelines.md)
   for ensuring merge requests do not negatively impact GitLab performance
-- [Profiling](profiling.md) a URL, measuring performance using Sherlock, or
-  tracking down N+1 queries using Bullet.
+- [Profiling](profiling.md) a URL or tracking down N+1 queries using Bullet.
 - [Cached queries guidelines](cached_queries.md), for tracking down N+1 queries
   masked by query caching, memory profiling and why should we avoid cached
   queries.

doc/development/merge_request_performance_guidelines.md

@@ -13,9 +13,7 @@ _every_ merge request **should** adhere to the guidelines outlined in this
 document. There are no exceptions to this rule unless specifically discussed
 with and agreed upon by backend maintainers and performance specialists.
 
-To measure the impact of a merge request you can use
-[Sherlock](profiling.md#sherlock). It's also highly recommended that you read
-the following guides:
+It's also highly recommended that you read the following guides:
 
 - [Performance Guidelines](performance.md)
 - [Avoiding downtime in migrations](avoiding_downtime_in_migrations.md)

doc/development/profiling.md

@@ -108,20 +108,6 @@ Find more information about different sampling modes in the [Stackprof docs](htt
 
 This is enabled for all users that can access the performance bar.
 
-## Sherlock
-
-Sherlock is a custom profiling tool built into GitLab. Sherlock is _only_
-available when running GitLab in development mode _and_ when setting the
-environment variable `ENABLE_SHERLOCK` to a non empty value. For example:
-
-```shell
-ENABLE_SHERLOCK=1 bundle exec rails s
-```
-
-Sherlock is also [available though the GitLab GDK](https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/doc/howto/sherlock.md).
-
-Recorded transactions can be found by navigating to `/sherlock/transactions`.
-
 ## Bullet
 
 Bullet is a Gem that can be used to track down N+1 query problems. Bullet section is