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* tsdb: add histograms-st-encoding feature flag Decouple the ST-capable histogram chunk encodings (EncHistogramST, EncFloatHistogramST) from the xor2-encoding feature flag and gate them behind a new histograms-st-encoding flag instead. Previously --enable-feature=xor2-encoding turned on both the float XOR2 encoding and the histogram ST encodings via a single useXOR2 boolean; that conflated two independent on-disk formats and made it impossible to opt into one without the other. ValueType.ChunkEncoding and NewChunk now take separate useXOR2 and useHistogramST flags. Dispatch only consumes the relevant flag per value type; data-driven callers that gate on actual ST presence in the samples (storage/series.go, tsdb/querier.go, tsdb/chunks/chunks.go) pass hasST for both. tsdb.Options gains EnableHistogramSTEncoding; tsdb.HeadOptions gains a matching atomic.Bool. The new flag is propagated through chunkOpts/headAppenderBase and read at every site that currently reads EnableXOR2Encoding (head append v1/v2, head_wal WAL/WBL replay, ooo_head_read). Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com> * update features testdata Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com> --------- Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com> |
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