Prometheus middleware for chi.
This is a port of negroni-prometheus middleware (written by Rene Zbinden).
Instead of logging request times, it is considered best practice to provide an endpoint for instrumentation tools (like prometheus).
go get github.com/766b/chi-prometheus
Take a look at the example.
An endpoint with the following information (stripped output):
# HELP chi_request_duration_milliseconds How long it took to process the request, partitioned by status code, method and HTTP path.
# TYPE chi_request_duration_milliseconds histogram
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="300"} 1
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="1200"} 1
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="5000"} 1
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="+Inf"} 1
chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/metrics",service="serviceName"} 2.003123
chi_request_duration_milliseconds_count{code="OK",method="GET",path="/metrics",service="serviceName"} 1
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="300"} 0
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="1200"} 0
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="5000"} 2
chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="+Inf"} 2
chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/ok",service="serviceName"} 4747.529026
chi_request_duration_milliseconds_count{code="OK",method="GET",path="/ok",service="serviceName"} 2
# HELP chi_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path.
# TYPE chi_requests_total counter
chi_requests_total{code="OK",method="GET",path="/metrics",service="serviceName"} 1
chi_requests_total{code="OK",method="GET",path="/ok",service="serviceName"} 2
Take a look at the example.
An endpoint with the following information (stripped output):
# HELP chi_pattern_request_duration_milliseconds How long it took to process the request, partitioned by status code, method and HTTP path (with patterns).
# TYPE chi_pattern_request_duration_milliseconds histogram
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="300"} 1
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="1200"} 1
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="5000"} 1
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="+Inf"} 1
chi_pattern_request_duration_milliseconds_sum{code="OK",method="GET",path="/metrics",service="test_service"} 0.975926
chi_pattern_request_duration_milliseconds_count{code="OK",method="GET",path="/metrics",service="test_service"} 1
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="300"} 0
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="1200"} 0
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="5000"} 2
chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="+Inf"} 2
chi_pattern_request_duration_milliseconds_sum{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 4755.052755
chi_pattern_request_duration_milliseconds_count{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 2
# HELP chi_pattern_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path (with patterns).
# TYPE chi_pattern_requests_total counter
chi_pattern_requests_total{code="OK",method="GET",path="/metrics",service="test_service"} 1
chi_pattern_requests_total{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 2