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Add comment about differences between agent mode and regular Prometheus 

Signed-off-by: Patryk Prus <p@trykpr.us>
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Patryk Prus 2025-08-19 18:33:52 -04:00
parent 676f7665fa
commit bbc9e47e42
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tsdb/agent/db.go
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@ -633,6 +633,7 @@ Loop:
// keepSeriesInWALCheckpointFn returns a function that is used to determine whether a series record should be kept in the checkpoint. // keepSeriesInWALCheckpointFn returns a function that is used to determine whether a series record should be kept in the checkpoint.
// last is the last WAL segment that was considered for checkpointing. // last is the last WAL segment that was considered for checkpointing.
// NOTE: the agent implementation here is different from the Prometheus implementation, in that it uses WAL segment numbers instead of timestamps.
func (db *DB) keepSeriesInWALCheckpointFn(last int) func(id chunks.HeadSeriesRef) bool { func (db *DB) keepSeriesInWALCheckpointFn(last int) func(id chunks.HeadSeriesRef) bool {
return func(id chunks.HeadSeriesRef) bool { return func(id chunks.HeadSeriesRef) bool {
// Keep the record if the series exists in the db. // Keep the record if the series exists in the db.