ProtocolGRPC means that the proxy protocol is the GRPC protocol.

ProtocolHTTPConnect means that the proxy protocol is http-connect.

StageConnect indicates that the dial failed at establishing connection to the proxy server.

StageProxy indicates that the dial failed at requesting the proxy server to proxy.

TransportTCP means that the transport is TCP.

TransportUDS means that the transport is UDS.

Metrics provides access to all dial metrics.

DialMetrics instruments dials to proxy server with prometheus metrics.