all: log when client info included in the request

cmd/ctrld/dns_proxy.go

@@ -237,6 +237,7 @@ func (p *prog) proxy(ctx context.Context, upstreams []string, failoverRcodes []i
 		if upstreamConfig.UpstreamSendClientInfo() {
 			ci := router.GetClientInfoByMac(macFromMsg(msg))
 			if ci != nil {
+				ctrld.Log(ctx, mainLog.Debug(), "including client info with the request")
 				ctx = context.WithValue(ctx, ctrld.ClientInfoCtxKey{}, ci)
 			}
 		}

doh.go

@@ -107,4 +107,5 @@ func addHeader(ctx context.Context, req *http.Request, sendClientInfo bool) {
 			}
 		}
 	}
+	Log(ctx, ProxyLog.Debug().Interface("header", req.Header), "sending request header")
 }