Update sessions metric name.

app/controllers/sessions_controller.rb

@@ -48,7 +48,7 @@ class SessionsController < Devise::SessionsController
   private
   def login_counter
-    @login_counter ||= Gitlab::Metrics.counter(:user_session_logins, 'User sign in count')
+    @login_counter ||= Gitlab::Metrics.counter(:user_session_logins_total, 'User sign in count')
   end
   # Handle an "initial setup" state, where there's only one user, it's an admin,

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -40,7 +40,7 @@ In this experimental phase, only a few metrics are available:
 | redis_ping_timeout                | Gauge     | Whether or not the last redis ping timed out |
 | redis_ping_success                | Gauge     | Whether or not the last redis ping succeeded |
 | redis_ping_latency_seconds        | Gauge     | Round trip time of the redis ping |
-| user_sessions_logins              | Counter   | Counter of how many users have logged in |
+| user_session_logins_total         | Counter   | Counter of how many users have logged in |
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