$ curl -s 'http://localhost:9090/metrics' | head -n 15
 
# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 6.166e-06
go_gc_duration_seconds{quantile="0.25"} 2.755e-05
go_gc_duration_seconds{quantile="0.5"} 5.363e-05
go_gc_duration_seconds{quantile="0.75"} 6.3458e-05
go_gc_duration_seconds{quantile="1"} 0.000257522
go_gc_duration_seconds_sum 0.001636119
go_gc_duration_seconds_count 22
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 39
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.13.5"} 1
