From adf225d0b36cf3b4a6df278b5e7e9010e663d8a0 Mon Sep 17 00:00:00 2001
From: huanggze <loganhuang@yunify.com>
Date: Wed, 26 Jun 2019 18:03:10 +0800
Subject: [PATCH] fix: fill empty metrics data with zeros

Signed-off-by: huanggze <loganhuang@yunify.com>
---
 pkg/models/metrics/metricsruleconst.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkg/models/metrics/metricsruleconst.go b/pkg/models/metrics/metricsruleconst.go
index 45f46d77c..4be60151a 100644
--- a/pkg/models/metrics/metricsruleconst.go
+++ b/pkg/models/metrics/metricsruleconst.go
@@ -13,6 +13,10 @@ limitations under the License.
 
 package metrics
 
+import (
+	"fmt"
+)
+
 const (
 	ResultTypeVector             = "vector"
 	ResultTypeMatrix             = "matrix"
@@ -731,3 +735,11 @@ var RulePromQLTmplMap = MetricMap{
 	"prometheus_up_sum":                          `prometheus:up:sum`,
 	"prometheus_tsdb_head_samples_appended_rate": `prometheus:prometheus_tsdb_head_samples_appended:sum_rate`,
 }
+
+func init() {
+	for metric, promql := range RulePromQLTmplMap {
+
+		// Use absent() to fill missing data with zero
+		RulePromQLTmplMap[metric] = fmt.Sprintf("%s or absent(%s)-1", promql, promql)
+	}
+}