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Dan Cech 8a233132e6 promql: track samples read per query ... Add a per-query samples-read counter that distinguishes storage I/O from the existing TotalSamples count. TotalSamples reports samples loaded into the evaluator and so over-counts when a sample is reused across multiple range-vector windows; samplesRead reflects what the storage layer actually had to read. For range-vector functions in range queries, samplesRead applies delta semantics: step 0 counts the full window, later steps count only the points not already present in the previous step's window. For other query shapes samplesRead equals TotalSamples. Expose the new counter: - as `samplesRead` and `samplesReadPerStep` in /api/v1/query{,_range} stats responses (the per-step variant only with stats=all and the per-step stats feature flag enabled); - as the `prometheus_engine_query_samples_read_total` Prometheus counter, reporting the cumulative samples-read across all queries; - in the OpenAPI schemas. Also update the per-step stats feature flag and querying API documentation, and add unit tests covering instant queries, range queries, range-vector functions, and subqueries. Signed-off-by: Dan Cech <dcech@grafana.com>		2 weeks ago
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openapi_3.1_golden.yaml	promql: track samples read per query	2 weeks ago
openapi_3.2_golden.yaml	promql: track samples read per query	2 weeks ago