Previously, only display the one that has been requested at least once.
Now it shows all metrics, as we do in v3.3 and v3.4+.
grpc_server_started_total{grpc_method="Alarm",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="AuthDisable",grpc_service="etcdserverpb.Auth",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="AuthEnable",grpc_service="etcdserverpb.Auth",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="Authenticate",grpc_service="etcdserverpb.Auth",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="Compact",grpc_service="etcdserverpb.KV",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="Defragment",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"} 0
grpc_server_started_total{grpc_method="DeleteRange",grpc_service="etcdserverpb.KV",grpc_type="unary"} 0
Should help document metrics.
Signed-off-by: Gyuho Lee <leegyuho@amazon.com>