Add two more metrics for CI/CD

As its hard right now to determine what is a good metric and whats not,
these two are not listed in the docs, nor will they get a CHANGELOG
entry.

app/services/ci/register_job_service.rb

@@ -30,6 +30,7 @@ module Ci
           # with StateMachines::InvalidTransition or StaleObjectError when doing run! or save method.
           build.runner_id = runner.id
           build.run!
+          register_success(build)
           return Result.new(build, true)
         rescue StateMachines::InvalidTransition, ActiveRecord::StaleObjectError
@@ -46,6 +47,7 @@ module Ci
         end
       end
+      register_failure
       Result.new(nil, valid)
     end
@@ -81,5 +83,27 @@ module Ci
     def shared_runner_build_limits_feature_enabled?
       ENV['DISABLE_SHARED_RUNNER_BUILD_MINUTES_LIMIT'].to_s != 'true'
     end
+
+    def register_failure
+      failed_attempt_counter.increase
+      attempt_counter.increase
+    end
+
+    def register_success(job)
+      job_queue_duration_seconds.observe({ shared_runner: @runner.shared? }, Time.now - job.created_at)
+      attempt_counter.increase
+    end
+
+    def failed_attempt_counter
+      @failed_attempt_counter ||= Gitlab::Metrics.counter(:job_register_attempts_failed_total, "Counts the times a runner tries to register a job")
+    end
+
+    def attempt_counter
+      @attempt_counter ||= Gitlab::Metrics.counter(:job_register_attempts_total, "Counts the times a runner tries to register a job")
+    end
+
+    def job_queue_duration_seconds
+      @job_queue_duration_seconds ||= Gitlab::Metrics.histogram(:job_queue_duration_seconds, 'Request handling execution time')
+    end
   end
 end

app/services/projects/update_pages_service.rb

@@ -33,8 +33,10 @@ module Projects
         success
       end
     rescue => e
+      register_failure
       error(e.message)
     ensure
+      register_attempt
       build.erase_artifacts! unless build.has_expiring_artifacts?
     end
@@ -168,5 +170,21 @@ module Projects
     def sha
       build.sha
     end
+
+    def register_attempt
+      pages_deployments_total_counter.increase
+    end
+
+    def register_failure
+      pages_deployments_failed_total_counter.increase
+    end
+
+    def pages_deployments_total_counter
+      @pages_deployments_total_counter ||= Gitlab::Metrics.counter(:pages_deployments_total, "Counter of GitLab Pages deployments triggered")
+    end
+
+    def pages_deployments_failed_total_counter
+      @pages_deployments_failed_total_counter ||= Gitlab::Metrics.counter(:pages_deployments_failed_total, "Counter of GitLab Pages deployments which failed")
+    end
   end
 end