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Export tracing spans to Prometheus

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Nigel Deakin
2017-10-20 18:28:42 +01:00
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examples/grafana/README.md
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@@ -99,11 +99,12 @@ You should then see the dashboard shown above. Now execute some functions and se
## Tracing metrics
Tracing spans from the Fn server are available as Prometheus metrics. Each span has a name that describes the operation being performed (for example `docker_wait_container`), and its duration in seconds. Each span name is represented by a separate histogram metric, which has a name of the form `fn_span_<span-name>_duration_seconds`.
Tracing spans from the Fn server are available as Prometheus metrics. Each span represents a timed internal operation such as a function call, and has
two main attributes: a name that describes the operation being performed (for example `docker_wait_container`), and its duration in seconds. Each span name is represented by a separate histogram metric, which has a name of the form `fn_span_<span-name>_duration_seconds`.
If the span is associated with a specific function invocation, the corresponding metric is given the labels `fn_app` and `fn_path` which are set to the application name and function path respectively.
A second example dashboard `fn_grafana_dashboard2.json` in this example's directory extends the first dashboard to show rate and duration data for a selection of tracing spans.
A second example dashboard `fn_grafana_dashboard2.json` in this example's directory shows rate and duration data for some significant operations.
<img src="../../docs/assets/GrafanaDashboard2.png" width="100%">