#20 add prometheus metrics endpoint

vendor/golang.org/x/sys/unix/syscall.go

vendor/golang.org/x/sys/unix/syscall_aix.go

vendor/golang.org/x/sys/unix/syscall_aix_ppc.go

vendor/golang.org/x/sys/unix/syscall_aix_ppc64.go

vendor/golang.org/x/sys/unix/syscall_bsd.go

vendor/golang.org/x/sys/unix/syscall_darwin.1_12.go

vendor/golang.org/x/sys/unix/syscall_darwin.1_13.go

vendor/golang.org/x/sys/unix/syscall_darwin.go

vendor/golang.org/x/sys/unix/syscall_darwin_amd64.go

vendor/golang.org/x/sys/unix/syscall_darwin_arm64.go

vendor/golang.org/x/sys/unix/syscall_darwin_libSystem.go

vendor/golang.org/x/sys/unix/syscall_dragonfly.go

vendor/golang.org/x/sys/unix/syscall_dragonfly_amd64.go

vendor/golang.org/x/sys/unix/syscall_freebsd.go

vendor/golang.org/x/sys/unix/syscall_freebsd_386.go

vendor/golang.org/x/sys/unix/syscall_freebsd_amd64.go

vendor/golang.org/x/sys/unix/syscall_freebsd_arm.go

vendor/golang.org/x/sys/unix/syscall_freebsd_arm64.go

vendor/golang.org/x/sys/unix/syscall_illumos.go

vendor/golang.org/x/sys/unix/syscall_linux.go