Metrics (#115)

* metrics add totalRooms and runningRooms.

* load initial metrics.

* fix.

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/docker/go-connections v0.4.0
 	github.com/go-chi/chi/v5 v5.0.10
 	github.com/go-chi/cors v1.2.1
+	github.com/prometheus/client_golang v1.17.0
 	github.com/rs/zerolog v1.31.0
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/viper v1.16.0
@@ -16,15 +17,19 @@ require (
 
 require (
 	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/docker/distribution v2.8.2+incompatible // indirect
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/moby/term v0.5.0 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
@@ -32,6 +37,9 @@ require (
 	github.com/opencontainers/image-spec v1.0.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
 	github.com/pkg/errors v0.9.1 // 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/sirupsen/logrus v1.9.3 // indirect
 	github.com/spf13/afero v1.9.5 // indirect
 	github.com/spf13/cast v1.5.1 // indirect
@@ -43,6 +51,7 @@ require (
 	golang.org/x/sys v0.12.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
 	golang.org/x/tools v0.6.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gotest.tools/v3 v3.5.1 // indirect
 )