docs: add peering metric doc (#13862)
docs: add peering metric doc (#13862)

Co-authored-by: Freddy <fdee9ee055edd33648f82e12cc1bca2f04502d5d@users.noreply.github.com>
Co-authored-by: Jeff Boruszak <a95dcccf69ddaf2a04efcf444b3a96b473cdff9b@users.noreply.github.com>
Co-authored-by: trujillo-adam <b4e1b7bcae9113f50a2193825cae19f0df281417@users.noreply.github.com>
hashicorp/consul,hashicorp/consul,hashicorp/consul,hashicorp/consul