tech: replace context.TODO with background ctx

pkg/api/metrics.go

@@ -33,7 +33,7 @@ func QueryMetrics(c *middleware.Context, reqDto dtos.MetricRequest) Response {
 		})
 	}
 
-	resp, err := tsdb.HandleRequest(context.TODO(), request)
+	resp, err := tsdb.HandleRequest(context.Background(), request)
 	if err != nil {
 		return ApiError(500, "Metric request error", err)
 	}

pkg/services/alerting/engine.go

@@ -98,7 +98,7 @@ func (e *Engine) processJob(grafanaCtx context.Context, job *Job) error {
 		}
 	}()
 
-	alertCtx, cancelFn := context.WithTimeout(context.TODO(), alertTimeout)
+	alertCtx, cancelFn := context.WithTimeout(context.Background(), alertTimeout)
 
 	job.Running = true
 	evalContext := NewEvalContext(alertCtx, job.Rule)

pkg/services/alerting/test_notification.go

@@ -50,7 +50,7 @@ func createTestEvalContext(cmd *NotificationTestCommand) *EvalContext {
 		State:       m.AlertStateAlerting,
 	}
 
-	ctx := NewEvalContext(context.TODO(), testRule)
+	ctx := NewEvalContext(context.Background(), testRule)
 	if cmd.Settings.Get("uploadImage").MustBool(true) {
 		ctx.ImagePublicUrl = "http://grafana.org/assets/img/blog/mixed_styles.png"
 	}

pkg/services/alerting/test_rule.go

@@ -49,7 +49,7 @@ func handleAlertTestCommand(cmd *AlertTestCommand) error {
 func testAlertRule(rule *Rule) *EvalContext {
 	handler := NewEvalHandler()
 
-	context := NewEvalContext(context.TODO(), rule)
+	context := NewEvalContext(context.Background(), rule)
 	context.IsTestRun = true
 
 	handler.Eval(context)

pkg/services/notifications/webhook.go

@@ -37,7 +37,7 @@ func processWebhookQueue() {
 	for {
 		select {
 		case webhook := <-webhookQueue:
-			err := sendWebRequestSync(context.TODO(), webhook)
+			err := sendWebRequestSync(context.Background(), webhook)
 
 			if err != nil {
 				webhookLog.Error("Failed to send webrequest ", "error", err)