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routing/http: feat: add client latency measure
Note that this measure includes some labels that also record: - HTTP status codes - HTTP method and path - Errors returned by the HTTP client - Call counts (included as part of histogram measure)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package client | ||
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| import ( | ||
| "go.opencensus.io/stats" | ||
| "go.opencensus.io/stats/view" | ||
| "go.opencensus.io/tag" | ||
| ) | ||
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| var ( | ||
| distMS = view.Distribution(0, 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000) | ||
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| measureLatency = stats.Int64("routing_http_client_latency", "the latency of operations by the routing HTTP client", stats.UnitMilliseconds) | ||
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| keyOperation = tag.MustNewKey("operation") | ||
| keyHost = tag.MustNewKey("host") | ||
| keyStatusCode = tag.MustNewKey("code") | ||
| keyError = tag.MustNewKey("error") | ||
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| ViewLatency = &view.View{ | ||
| Measure: measureLatency, | ||
| Aggregation: distMS, | ||
| TagKeys: []tag.Key{keyOperation, keyHost, keyStatusCode, keyError, tag.MustNewKey("name")}, | ||
| } | ||
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| OpenCensusViews = []*view.View{ | ||
| ViewLatency, | ||
| } | ||
| ) |