feat(stats)!: per-key cardinality limits#2211
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| client_side_stats: StatsComputationConfig { | ||
| status: ArcSwap::new(stats.into()), | ||
| stats_cardinality_limit: self.stats_cardinality_limit, | ||
| stats_cardinality_limits: self.stats_cardinality_limits, |
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For exporters configured with OTLP metrics, the stats concentrator is created earlier with None for the new cardinality limits, and check_agent_info returns early when otlp_stats_enabled, so the value stored here never reaches that path. In that configuration, callers using set_stats_cardinality_limit still get the defaults for OTLP trace metrics instead of their configured per-key limits; pass self.stats_cardinality_limits into the OTLP SpanConcentrator::new call as well.
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save memory by storing value hashes only, u64 has enough values to make collisions rare and in case we still get a collision storing 1 extra key should be fine
…alityLimitConfig binding
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BenchmarksComparisonBenchmark execution time: 2026-07-10 13:03:13 Comparing candidate commit 83043a4 in PR branch Found 2 performance improvements and 5 performance regressions! Performance is the same for 170 metrics, 10 unstable metrics.
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What does this PR do?
Implement per-key cardinality limits to stats computation.
Also:
[]->[tracer_blocked_value]encode_grouped_statsmeta with empty value:key:->key(breaking change ?)Motivation
CSS spec compliance.
Additional Notes
Todo:
How to test the change?