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Simple Go `net/http` instrumentation for Prometheus\n\nThis library is a fork of Prometheus golang_client/prometheus/http handler proxy:\nhttps://github.com/prometheus/client_golang/blob/master/prometheus/http.go#L152\n\nThe documentation of `InstrumentHandler` mentions the following problems:\n```\n - It uses Summaries rather than Histograms. Summaries are not useful if\n aggregation across multiple instances is required.\n\n - It uses microseconds as unit, which is deprecated and should be replaced by\n seconds.\n\n - The size of the request is calculated in a separate goroutine. Since this\n calculator requires access to the request header, it creates a race with\n any writes to the header performed during request handling.\n httputil.ReverseProxy is a prominent example for a handler\n performing such writes.\n\n```\n\nThe first two problems are mitigated. The third one is hard and as a moment of writing \nI didn't find a need to implement it, thus for a sake of race condition detection it\nwas disabled.\n\nAdditionally a gauge `inflight_requests` was added.\n\nThe histogram buckets: \n\n```\n    []float64{0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7,\n              0.8, 0.9, 1., 2., 5., 10., 20., 30., 40., 50.}\n```\n\n## Get the library:\n```\ngo get github.com/orian/go-http-instrument/instrumentation\n```\n\n## For developers\nFor a testing purposes I've prepared a super simple http server to run in Docker. \n\nThe `bin` directory contains a trivial binary. To compile:\n\n```\ncd bin\nCGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o simpleserver simpleserver.go\n```\n\nThan one needs to execute:\n\n```\ndocker build -t instrument/demoserver .\ndocker run --rm -it --net promnet -p 8080:8080 \\\n    --name httpexample instrument/demoserver\n```\n\nPrometheus:\n```\ndocker pull prom/prometheus\n\ndocker run --rm -it -p 9090:9090 --net promnet \\ \n    --name prom -v $PWD/prom/prometheus.yaml:/etc/prometheus/prometheus.yml \\\n    prom/prometheus\n```\n\nTo see changes in metrics run some queries. The demo server accepts two query params:\n  \n  - `dur` - how long the request should take.\n  - `code` - what HTTP status code to return.\n\n```\ncurl -v \"localhost:8080/\" \u0026\ncurl -v \"localhost:8080/?code=404\u0026dur=1.5\" \u0026\ncurl -v \"localhost:8080/?code=404\u0026dur=15\" \u0026\ncurl -v \"localhost:8080/?dur=105\" \u0026\ncurl -v \"localhost:8080/?code=500\u0026dur=50\" \u0026 \ncurl -v \"localhost:8080/?dur=34\" \u0026\ncurl -v \"localhost:8080/?dur=20\" \u0026\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Forian%2Fgo-http-instrument","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Forian%2Fgo-http-instrument","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Forian%2Fgo-http-instrument/lists"}