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docs(mxgateway): sync Metrics.md to renamed meter + seconds histogram units

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Joseph Doherty
2026-06-01 16:48:46 -04:00
parent 3965a7741e
commit dbf550da8b
1 changed files with 6 additions and 6 deletions
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docs/Metrics.md
+6 -6
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@@ -4,7 +4,7 @@ The metrics subsystem exposes counters, histograms, and observable gauges that d
## Overview
`GatewayMetrics` is a singleton (registered in `GatewayApplication.cs`) that owns a single `Meter` named `ZB.MOM.WW.MxGateway.Server` and a set of synchronised counters, histograms, and observable gauges. Subsystems call typed mutator methods (`SessionOpened`, `CommandFailed`, `EventReceived`, etc.) rather than touching the `Meter` directly, which keeps the OpenTelemetry instrument names and tag conventions in one place. A `lock (_syncRoot)` block guards the scalar fields used by `GetSnapshot`, while per-event maps use `ConcurrentDictionary<string, long>` so the hot event path avoids the lock.
`GatewayMetrics` is a singleton (registered in `GatewayApplication.cs`) that owns a single `Meter` named `ZB.MOM.WW.MxGateway` and a set of synchronised counters, histograms, and observable gauges. Subsystems call typed mutator methods (`SessionOpened`, `CommandFailed`, `EventReceived`, etc.) rather than touching the `Meter` directly, which keeps the OpenTelemetry instrument names and tag conventions in one place. A `lock (_syncRoot)` block guards the scalar fields used by `GetSnapshot`, while per-event maps use `ConcurrentDictionary<string, long>` so the hot event path avoids the lock.
## Meter and OpenTelemetry Compatibility
@@ -13,7 +13,7 @@ The meter name is exposed as a constant so that hosting code can register it wit
```csharp
public sealed class GatewayMetrics : IDisposable
{
public const string MeterName = "ZB.MOM.WW.MxGateway.Server";
public const string MeterName = "ZB.MOM.WW.MxGateway";
public GatewayMetrics()
{
@@ -50,12 +50,12 @@ All counters are `Counter<long>`. Tag values come from the call sites listed und
### Histograms
Histograms record durations in milliseconds (the `unit` argument on `CreateHistogram`):
Histograms record durations in seconds (the `unit` argument on `CreateHistogram`):
```csharp
_workerStartupLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.workers.startup.duration", "ms");
_commandLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.commands.duration", "ms");
_eventStreamSendLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.events.stream_send.duration", "ms");
_workerStartupLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.workers.startup.duration", "s");
_commandLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.commands.duration", "s");
_eventStreamSendLatencyHistogram = _meter.CreateHistogram<double>("mxgateway.events.stream_send.duration", "s");
```
| Instrument | Tags | What it measures |