Merge branch 'add_link_to_sidekiq_api' into 'master'

Add missing link to sidekiq metrics in API README



See merge request !4837

doc/api/README.md

@@ -32,6 +32,7 @@ following locations:
 - [Services](services.md)
 - [Session](session.md)
 - [Settings](settings.md)
+- [Sidekiq metrics](sidekiq_metrics.md)
 - [System Hooks](system_hooks.md)
 - [Tags](tags.md)
 - [Users](users.md)