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Send tracing spans to Prometheus

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Nigel Deakin
2017-10-20 16:30:19 +01:00
parent de4a20624d
commit 39feaf8b69
7 changed files with 1856 additions and 11 deletions
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examples/grafana/README.md
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@@ -90,11 +90,20 @@ Create a datasource to obtain metrics from Promethesus:
* Click **Add** and then **Save and test**
Import the example dashboard that displays metrics from the Fn server:
* Click on the main menu at the top left and choose **Dashboards** and then **Home**
* Click on **Home** at the top and then **Import dashboard**
* Click on the main menu at the top left and choose **Dashboards** and then **Import**
* In the dialog that opens, click **Upload .json file** and specify `fn_grafana_dashboard.json` in this example's directory.
* Specify the Prometheus data source that you just created
* Click **Import**
You should then see the dashboard shown above. Now execute some functions and see the graphs update.
## 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`.
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 shows rate and duration data for a selection of tracing spans. This is `fn_grafana_dashboard2.json` in this example's directory.
<img src="../../docs/assets/GrafanaDashboard.png" width="800">