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9376aa7c88
The transaction reduce-relay subsystem (selected vs suppressed peers,
feature-disabled peers, missing-tx frequency) was computed in OverlayImpl's
TxMetrics but only surfaced via the get_counts JSON RPC — invisible to
Prometheus/Grafana, despite being the central efficiency KPI for the feature.
Add an observable gauge xrpld_reduce_relay_metrics{metric} that reads
Overlay::txMetrics() and parses its rolling-average fields:
- selected_peers (txr_selected_cnt)
- suppressed_peers (txr_suppressed_cnt)
- not_enabled_peers (txr_not_enabled_cnt)
- missing_tx_freq (txr_missing_tx_freq)
The JSON values are decimal strings (std::to_string), parsed via std::stoll —
the same JSON-reading pattern as registerNodeStoreGauge. No new Overlay
accessor or core-interface change required.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>