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labels: note that Hash may change 

For performance reasons we may use a different implementation of Hash()
in future, so note this so callers can be warned.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-11-28 16:16:55 +00:00
parent dfa5cd55db
commit 8d4140a06e
1 changed files with 1 additions and 0 deletions
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model/labels/labels.go
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@ -134,6 +134,7 @@ func (ls Labels) MatchLabels(on bool, names ...string) Labels {
} }
// Hash returns a hash value for the label set. // Hash returns a hash value for the label set.
// Note: the result is not guaranteed to be consistent across different runs of Prometheus.
func (ls Labels) Hash() uint64 { func (ls Labels) Hash() uint64 {
// Use xxhash.Sum64(b) for fast path as it's faster. // Use xxhash.Sum64(b) for fast path as it's faster.
b := make([]byte, 0, 1024) b := make([]byte, 0, 1024)