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Merge branch 'pratik/otel-phase8-log-correlation' into pratik/otel-phase9-metric-gap-fill

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Pratik Mankawde
2026-07-10 18:49:14 +01:00
parent cb413c18d3 e9a0b49c5b
commit 505dd360ee
1 changed files with 15 additions and 7 deletions
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OpenTelemetryPlan/09-data-collection-reference.md
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@@ -545,16 +545,24 @@ prefix=xrpld
### 2.3 Histograms (Event timers)
| Prometheus Metric | Source File | Unit | Description |
| ----------------- | ----------------- | ----- | ------------------------------ |
| `rpc_time` | ServerHandler.cpp | ms | RPC response time distribution |
| `rpc_size` | ServerHandler.cpp | bytes | RPC response size distribution |
| `ios_latency` | Application.cpp | ms | I/O service loop latency |
| `pathfind_fast` | PathRequests.h | ms | Fast pathfinding duration |
| `pathfind_full` | PathRequests.h | ms | Full pathfinding duration |
| Prometheus Metric | Source File | Unit | Description |
| ----------------- | ----------------- | ---- | ------------------------------ |
| `rpc_time` | ServerHandler.cpp | ms | RPC response time distribution |
| `rpc_size` | ServerHandler.cpp | ms\* | RPC response size (see note) |
| `ios_latency` | Application.cpp | ms | I/O service loop latency |
| `pathfind_fast` | PathRequests.h | ms | Fast pathfinding duration |
| `pathfind_full` | PathRequests.h | ms | Full pathfinding duration |
Quantiles collected: 0th, 50th, 90th, 95th, 99th, 100th percentile.
\* **`rpc_size` instrument mismatch (known issue):** response size in bytes is
recorded through the millisecond-scaled event histogram (`makeEvent`), so it is
exported as `rpc_size_milliseconds_bucket` with time-scaled boundaries that top
out at 5000. Byte values above ~5 KB saturate in the last bucket, so the
percentiles are not true byte sizes. The _RPC & Pathfinding_ panel is flagged
accordingly. A dedicated byte-unit histogram is needed to fix this; tracked
separately.
**Grafana dashboards**: _Node Health_ (`ios_latency`), _RPC & Pathfinding_ (`rpc_time`, `rpc_size`, `pathfind_*`)
### 2.4 Overlay Traffic Metrics