Add monitor/debug packages

debug/proto/debug.proto

@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+service Debug {
+ 	rpc Health(HealthRequest) returns (HealthResponse) {}
+ 	rpc Stats(StatsRequest) returns (StatsResponse) {}
+}
+
+message HealthRequest {
+}
+
+message HealthResponse {
+	// default: ok
+	string status = 1;
+}
+
+message StatsRequest {
+}
+
+message StatsResponse {
+	// unix timestamp
+	uint64 started = 1;
+	// in seconds
+	uint64 uptime = 2;
+	// in bytes
+	uint64 memory = 3;
+	// num threads
+	uint64 threads = 4;
+	// total gc in nanoseconds
+	uint64 gc = 5;
+}