Prometheus: Preallocate data for Prometheus backend response parsing (#17490)

6a76a92a · Oleg Kovalov · Carl Bergquist · 4ddb8607 · 6a76a92a
Commit 6a76a92a authored Jun 10, 2019 by Oleg Kovalov Committed by Carl Bergquist Jun 10, 2019
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Showing with 3 additions and 2 deletions

pkg/tsdb/prometheus/prometheus.go
+3 -2

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--- a/pkg/tsdb/prometheus/prometheus.go
+++ b/pkg/tsdb/prometheus/prometheus.go
@@ -199,8 +199,9 @@ func parseResponse(value model.Value, query *PrometheusQuery) (*tsdb.QueryResult

 	for _, v := range data {
 		series := tsdb.TimeSeries{
-			Name: formatLegend(v.Metric, query),
-			Tags: map[string]string{},
+			Name:   formatLegend(v.Metric, query),
+			Tags:   make(map[string]string, len(v.Metric)),
+			Points: make([]tsdb.TimePoint, 0, len(v.Values)),
 		}

 		for k, v := range v.Metric {