improve agent shards calculation (#1373)

Co-authored-by: Herve Nicol <[email protected]>
giantswarm · Sep 20, 2023 · 9ad013e · 9ad013e
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- computation of number of shards: rely on max number of series over the last 6h.
+
 ### Fixed
 
 - Support absolute Grafana dashboard URLs.

diff --git a/pkg/prometheusquerier/querier.go b/pkg/prometheusquerier/querier.go
@@ -29,7 +29,7 @@ func QueryTSDBHeadSeries(cluster string) (float64, error) {
 	api := v1.NewAPI(c)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
-	val, _, err := api.Query(ctx, "prometheus_tsdb_head_series", time.Now()) // Ignoring warnings for now.
+	val, _, err := api.Query(ctx, "max_over_time(prometheus_tsdb_head_series[6h])", time.Now()) // Ignoring warnings for now.
 	cancel()
 	if err != nil {
 		return 0, err