add prometheus endpoint and metrics

BuoyantIO / slow_cooker

A load tester focused on lifecycle issues and long-running tests

Apache License 2.0

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add prometheus endpoint and metrics #45

Closed siggy closed 7 years ago

siggy commented 7 years ago

this change introduces a /metrics endpoint to the slow_cooker process.

it currently exports 3 stats

request count
success count
latency histogram

note that unlike the existing histogram code, it only records latencies for successful requests. the intent is to not report low latencies to services that are failing fast. open to discussion on this.