feat: add prometheus metrics

go.mod

@@ -10,6 +10,8 @@ require (
  github.com/djherbis/buffer v1.2.0
  github.com/djherbis/nio/v3 v3.0.1
  github.com/golang/protobuf v1.5.3
+ github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus v1.0.0
+ github.com/inhies/go-bytesize v0.0.0-20220417184213-4913239db9cf
  github.com/juju/errors v1.0.0
  github.com/nats-io/nats-server/v2 v2.9.22
  github.com/nats-io/nats.go v1.30.2
@@ -24,22 +26,29 @@ require (
 
 require (
  github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+ github.com/beorn7/perks v1.0.1 // indirect
+ github.com/cespare/xxhash/v2 v2.2.0 // indirect
  github.com/charmbracelet/lipgloss v0.8.0 // indirect
  github.com/davecgh/go-spew v1.1.1 // indirect
  github.com/go-logfmt/logfmt v0.6.0 // indirect
- github.com/inhies/go-bytesize v0.0.0-20220417184213-4913239db9cf // indirect
+ github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.0.0-rc.3 // indirect
  github.com/klauspost/compress v1.17.0 // indirect
  github.com/klauspost/cpuid/v2 v2.2.5 // indirect
  github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
  github.com/mattn/go-isatty v0.0.19 // indirect
  github.com/mattn/go-runewidth v0.0.15 // indirect
+ github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
  github.com/minio/highwayhash v1.0.2 // indirect
  github.com/muesli/reflow v0.3.0 // indirect
  github.com/muesli/termenv v0.15.2 // indirect
  github.com/nats-io/jwt/v2 v2.5.0 // indirect
  github.com/nats-io/nkeys v0.4.5 // indirect
  github.com/nats-io/nuid v1.0.1 // indirect
  github.com/pmezard/go-difflib v1.0.0 // indirect
+ github.com/prometheus/client_golang v1.17.0 // indirect
+ github.com/prometheus/client_model v0.4.1-0.20230718164431-9a2bf3000d16 // indirect
+ github.com/prometheus/common v0.44.0 // indirect
+ github.com/prometheus/procfs v0.11.1 // indirect
  github.com/rivo/uniseg v0.4.4 // indirect
  golang.org/x/crypto v0.13.0 // indirect
  golang.org/x/net v0.15.0 // indirect