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[consensus] Fix BATCH_NUM_PER_BLOCK histogram buckets #19473

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danielxiangzl merged 3 commits into from
Apr 21, 2026
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[consensus] Fix BATCH_NUM_PER_BLOCK histogram buckets #19473

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[consensus] Fix BATCH_NUM_PER_BLOCK histogram buckets
danielxiangzl Apr 16, 2026
15fbda3
[consensus] Fix buckets for proof/batch count histograms
danielxiangzl Apr 20, 2026
9c62399
Merge branch 'main' into daniel/fix-batch-num-buckets
danielxiangzl Apr 20, 2026
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2 changes: 1 addition & 1 deletion consensus/src/quorum_store/counters.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,7 @@ pub static BATCH_NUM_PER_BLOCK: Lazy<HistogramVec> = Lazy::new(|| {
"quorum_store_batch_num_per_block",
"Histogram for the number of batches per (committed) blocks.",
&["type"],
TRANSACTION_COUNT_BUCKETS.clone(),
PROOF_COUNT_BUCKETS.clone(),
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@cursor cursor Bot Apr 16, 2026

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Bucket fix is correct. BATCH_NUM_PER_BLOCK measures proof/batch counts per block (observed values of proof_num, inline_batch_num, opt_batch_num — all small integers, typically < 500). PROOF_COUNT_BUCKETS (max 500) is the right scale; TRANSACTION_COUNT_BUCKETS (exponential to ~25 000+) was semantically mismatched.

Two adjacent metrics with the same scale mismatch remain: PROOF_SIZE_WHEN_PULL (line ~408) and NUM_BATCHES_WITHOUT_PROOF_OF_STORE (line ~380) — both measure proof/batch counts but still use TRANSACTION_COUNT_BUCKETS.

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@cursor cursor Bot Apr 16, 2026

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[INFORMATIONAL] The bucket swap from TRANSACTION_COUNT_BUCKETS (exponential, ~1.5 to ~25,251) to PROOF_COUNT_BUCKETS (hand-tuned, 1–500) is semantically correct: this metric counts batches/proofs per committed block, which in practice stays in the tens-to-low-hundreds range. The fix also makes this metric consistent with PROOFS_WITHOUT_BATCH_SUMMARY, PROOFS_WITH_BATCH_SUMMARY, and NUM_PROOFS_IN_PROOF_QUEUE_AFTER_PULL, which already use PROOF_COUNT_BUCKETS.

Note for follow-up: PROOF_SIZE_WHEN_PULL (line 407) and NUM_BATCHES_WITHOUT_PROOF_OF_STORE (line 378) are semantically equivalent (probe counts, not tx counts) but still use TRANSACTION_COUNT_BUCKETS. Aligning those in a separate PR would complete the consistency story.

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.unwrap()
});
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