feat: expose workspace statuses (with details) as a prometheus metric (#12762)

Implements #12462

cli/server.go

@@ -209,7 +209,7 @@ func enablePrometheus(
 	}
 	afterCtx(ctx, closeUsersFunc)
 
-	closeWorkspacesFunc, err := prometheusmetrics.Workspaces(ctx, options.PrometheusRegistry, options.Database, 0)
+	closeWorkspacesFunc, err := prometheusmetrics.Workspaces(ctx, options.Logger.Named("workspaces_metrics"), options.PrometheusRegistry, options.Database, 0)
 	if err != nil {
 		return nil, xerrors.Errorf("register workspaces prometheus metric: %w", err)
 	}

cli/server_test.go

@@ -973,7 +973,6 @@ func TestServer(t *testing.T) {
 
 			scanner := bufio.NewScanner(res.Body)
 			hasActiveUsers := false
-			hasWorkspaces := false
 			for scanner.Scan() {
 				// This metric is manually registered to be tracked in the server. That's
 				// why we test it's tracked here.
@@ -981,10 +980,6 @@ func TestServer(t *testing.T) {
 					hasActiveUsers = true
 					continue
 				}
-				if strings.HasPrefix(scanner.Text(), "coderd_api_workspace_latest_build_total") {
-					hasWorkspaces = true
-					continue
-				}
 				if strings.HasPrefix(scanner.Text(), "coderd_db_query_latencies_seconds") {
 					t.Fatal("db metrics should not be tracked when --prometheus-collect-db-metrics is not enabled")
 				}
@@ -992,7 +987,6 @@ func TestServer(t *testing.T) {
 			}
 			require.NoError(t, scanner.Err())
 			require.True(t, hasActiveUsers)
-			require.True(t, hasWorkspaces)
 		})
 
 		t.Run("DBMetricsEnabled", func(t *testing.T) {