Add Cleaning up stale Redis sessions to Clean up page

doc/administration/operations/cleaning_up_redis_sessions.md

@@ -34,7 +34,7 @@ rcli() {
   # This example works for Omnibus installations of GitLab 7.3 or newer. For an
   # installation from source you will have to change the socket path and the
   # path to redis-cli.
-  sudo /opt/gitlab/embedded/bin/redis-cli -s /var/opt/gitlab/redis/redis.shared_state.socket "$@"
+  sudo /opt/gitlab/embedded/bin/redis-cli -s /var/opt/gitlab/redis/redis.socket "$@"
 }
 
 # test the new shell function; the response should be PONG

doc/raketasks/cleanup.md

@@ -201,6 +201,10 @@ sudo gitlab-rake gitlab:cleanup:sessions:active_sessions_lookup_keys
 bundle exec rake gitlab:cleanup:sessions:active_sessions_lookup_keys RAILS_ENV=production
 ```
 
+## Cleaning up stale Redis sessions
+
+[Clean up stale sessions](../administration/operations/cleaning_up_redis_sessions.md) to compact the Redis database after you upgrade to GitLab 7.3.
+
 ## Container Registry garbage collection
 
 Container Registry can use considerable amounts of disk space. To clear up