metrics

This function exposes metrics from Prometheus.

It queries Prometheus for a function's 2xx and non-2xx invocations count and returns a JSON response of type:

{
    "success": 10,
    "failure": 8
}

It takes function's name (i.e. myFunction [required]) and metrics_window (i.e. 24h [default: 60m] from a query and is invoked by GET request to http://gateway-url:8080/function/metrics?function=myFunction&metrics_window=24h

Note: If you're running the function on Swarm, you should update prometheus_host in gateway_config.yml to prometheus, i.e. removing the namespace suffix for Kubernetes.

Note: metrics function requires prometheus service to be up and running. If you scale down prometheus to 0, this will result in function invocation count not being updated and an error invoking metrics: Couldn't get metrics from Prometheus for function...