feat: add functions to build attestations and blocks#30
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Apr 21, 2026
… PR #30 (#312) ## Motivation Implements the `lean_attestations_production_time_seconds` histogram defined in [leanEthereum/leanMetrics#30](leanEthereum/leanMetrics#30), which measures the end-to-end time a node spends producing attestations for all its validators in a given slot. ## Description ### New Metric | Metric | Type | Buckets | Sample collection event | |--------|------|---------|-------------------------| | `lean_attestations_production_time_seconds` | Histogram | 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 0.75, 1 | On attestation production | ### Implementation - **`crates/blockchain/src/metrics.rs`**: registers the histogram under the `Validator Metrics` family and exposes `time_attestations_production()`, which returns a `TimingGuard` that observes the duration on drop. Added to the `init()` eager-registration list so the metric appears on `/metrics` from process start. - **`crates/blockchain/src/lib.rs`**: instruments `produce_attestations()` with `let _timing = metrics::time_attestations_production();` at the top of the function, capturing the full flow: 1. Attestation data construction (`store::produce_attestation_data`) 2. Per-validator signing 3. Self-delivery via `on_gossip_attestation` 4. Gossip publish ### Documentation - **`docs/metrics.md`**: adds a `Buckets` column to the Validator Metrics table (consistent with the other tables in the doc) and lists the new metric alongside `lean_validators_count` and `lean_is_aggregator`. ## How to Test 1. `make fmt` - passes 2. `make lint` - passes (clippy clean) 3. `make test` - passes 4. Run a local devnet and verify the metric appears on the `/metrics` endpoint (port 5054): ``` curl -s localhost:5054/metrics | grep lean_attestations_production_time_seconds ``` You should see the histogram buckets populate as the node produces attestations each slot. ## Related - leanMetrics spec: leanEthereum/leanMetrics#30 - Previous metrics PR: #289 (Devnet-4 metrics from leanMetrics PR #29)
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