Expose HTTP/gRPC metrics to OpenTelemetry as well #11564
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -18,36 +18,79 @@ | |
| package middleware | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
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| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/metric" | ||
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| "github.com/elastic/apm-server/internal/beater/request" | ||
| "github.com/elastic/elastic-agent-libs/monitoring" | ||
| ) | ||
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| type monitoringMiddleware struct { | ||
| meter metric.Meter | ||
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| ints map[request.ResultID]*monitoring.Int | ||
| counters map[request.ResultID]metric.Int64Counter | ||
| } | ||
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| func (m *monitoringMiddleware) Middleware() Middleware { | ||
| return func(h request.Handler) (request.Handler, error) { | ||
| return func(c *request.Context) { | ||
| ctx := context.Background() | ||
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| m.getMetric(request.IDRequestCount).Add(ctx, 1) | ||
| m.inc(request.IDRequestCount) | ||
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| h(c) | ||
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| m.getMetric(request.IDResponseCount).Add(ctx, 1) | ||
| m.inc(request.IDResponseCount) | ||
| if c.Result.StatusCode >= http.StatusBadRequest { | ||
| m.getMetric(request.IDResponseErrorsCount).Add(ctx, 1) | ||
| m.inc(request.IDResponseErrorsCount) | ||
| } else { | ||
| m.getMetric(request.IDResponseValidCount).Add(ctx, 1) | ||
| m.inc(request.IDResponseValidCount) | ||
| } | ||
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| m.getMetric(c.Result.ID).Add(ctx, 1) | ||
| m.inc(c.Result.ID) | ||
| }, nil | ||
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| } | ||
| } | ||
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| func (m *monitoringMiddleware) inc(id request.ResultID) { | ||
| if counter, ok := m.ints[id]; ok { | ||
| counter.Inc() | ||
| } | ||
| } | ||
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| func (m *monitoringMiddleware) getMetric(n request.ResultID) metric.Int64Counter { | ||
| name := "http.server." + n | ||
|
There was a problem hiding this comment. I named those metrics We can rename those metrics in the local exporter. |
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| if met, ok := m.counters[name]; ok { | ||
| return met | ||
| } | ||
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| nm, _ := m.meter.Int64Counter(string(name)) | ||
| m.counters[name] = nm | ||
| return nm | ||
| } | ||
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| // MonitoringMiddleware returns a middleware that increases monitoring counters for collecting metrics | ||
| // about request processing. As input parameter it takes a map capable of mapping a request.ResultID to a counter. | ||
| func MonitoringMiddleware(m map[request.ResultID]*monitoring.Int, mp metric.MeterProvider) Middleware { | ||
| if mp == nil { | ||
| mp = otel.GetMeterProvider() | ||
| } | ||
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| mid := &monitoringMiddleware{ | ||
| meter: mp.Meter("internal/beater/middleware"), | ||
| ints: m, | ||
| counters: map[request.ResultID]metric.Int64Counter{}, | ||
| } | ||
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| return mid.Middleware() | ||
| } | ||
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question: why do we have an additional
IDResponseErrorsInternalin monitoringInt ?There was a problem hiding this comment.
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I haven't really figured out why, but nothing can set it from this interceptor, so I suspect it's because something elsewhere sets it, only for monitoring.Int.
The only location that sets it though is jaeger, and it's not executed here. So it may be state from a previous test?
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I have removed the metric from monitoring.Int, and the test doesn't fail either. So it does seem it's not being incremented in that interceptor (and the monitoring.Int test doesn't check for metrics that aren't emitted).