Add additional tests to spec

Test for all cases of "other" buckets.

spec/database/ci_builds_spec.rb

@@ -81,6 +81,9 @@ describe GitLab::Monitor::Database do
       expect(writer.string).to match(/ci_pending_builds{namespace="foo",shared_runners="yes"} 30/)
       expect(writer.string).to match(/ci_pending_builds{namespace="bar",shared_runners="yes"} 50/)
       expect(writer.string).to match(/ci_pending_builds{namespace="",shared_runners="yes"} 3/)
+      expect(writer.string).to match(/ci_pending_builds{namespace="",shared_runners="no"} 0/)
+      expect(writer.string).to match(/ci_created_builds{namespace="",shared_runners="yes"} 0/)
+      expect(writer.string).to match(/ci_created_builds{namespace="",shared_runners="no"} 0/)
       expect(writer.string).to match(/ci_builds_stale{status="running",when="last_hour"} 2/)
       expect(writer.string).to match(/ci_running_builds{runner="1",shared_runner="yes",mirror="no",pending_delete="no",mirror_trigger_builds="no"} 15/)
       expect(writer.string).to match(/ci_running_builds{runner="2",shared_runner="no",mirror="yes",pending_delete="no",mirror_trigger_builds="yes"} 5/)