agent: add per-endpoint proxy metrics #220
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Fixes #216, where if the agent runs multiple endpoints, it attempts to register the same metrics multiple times so panics. This extends the proxy metrics to include an endpoint label, such as: ``` piko_agent_requests_total{endpoint="endpoint1",method="GET",status="200"} 1034 piko_agent_requests_total{endpoint="endpoint2",method="GET",status="200"} 1234 ``` It also registers the metrics only once to avoid panicing.
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Fixes #216, where if the agent runs multiple endpoints, it attempts to register the same metrics multiple times so panics.
This extends the proxy metrics to include an
endpointlabel, such as:It also registers the metrics only once to avoid panicing.
(Based on approach in #217)