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* add jaeger support, link hot container & req span * adds jaeger support now with FN_JAEGER_URL, there's a simple tutorial in the operating/metrics.md file now and it's pretty easy to get up and running. * links a hot request span to a hot container span. when we change this to sample at a lower ratio we'll need to finagle the hot container span to always sample or something, otherwise we'll hide that info. at least, since we're sampling at 100% for now if this is flipped on, can see freeze/unfreeze etc. if they hit. this is useful for debugging. note that zipkin's exporter does not follow the link at all, hence jaeger... and they're backed by the Cloud Empire now (CNCF) so we'll probably use it anyway. * vendor: add thrift for jaeger
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Metrics
Zipkin
You can use zipkin to gather traces from fn.
Running a zipkin node is easy to get started, they have a docker container:
With zipkin running you can point functions to it using an env var:
ZIPKIN_URL=http://zipkin:9411/api/v1/spans
Open your browser to observe:
http://localhost:9411
Jaeger
We have support for Jaeger traces, as well.
It is easy to get an all-in-one container of jaeger running to test:
And then point fn to jaeger with the environment variable:
JAEGER_URL=http://jaeger:14268
Open browser to observe:
http://localhost:16686
Prometheus
Fn offers a prometheus metrics endpoint at /metrics
TODO we need to consolidate docs around this (3 places).