[VOL-1024]  This update consists of:

1) Inter-container kafka library in Go
2) initial set of proto definitions
3) Test cases for the kafka library

Change-Id: Ibe8b0f673a90bbe4cb92847ce40f31ec2d0b6244
diff --git a/protos/health.proto b/protos/health.proto
new file mode 100644
index 0000000..0730eac
--- /dev/null
+++ b/protos/health.proto
@@ -0,0 +1,36 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/api/annotations.proto";
+import "google/protobuf/empty.proto";
+import "meta.proto";
+
+// Encode health status of a Voltha instance
+message HealthStatus {
+
+    // Health states
+    enum HealthState {
+        HEALTHY = 0;  // The instance is healthy
+        OVERLOADED = 1;  // The instance is overloaded, decrease query rate
+        DYING = 2;  // The instance is in a critical condition, do not use it
+    }
+
+    // Current state of health of this Voltha instance
+    HealthState state = 1 [(access) = READ_ONLY];
+}
+
+// Health related services
+service HealthService {
+
+    // Return current health status of a Voltha instance
+    rpc GetHealthStatus(google.protobuf.Empty) returns (HealthStatus) {
+        option (google.api.http) = {
+            get: "/health"
+        };
+    }
+
+}
+