feat: adaptive lookback seconds for monovertex

pkg/apis/proto/mvtxdaemon/mvtxdaemon.proto

@@ -48,6 +48,10 @@ message GetMonoVertexStatusResponse {
   MonoVertexStatus status = 1;
 }
 
+message GetMonoVertexLookbackResponse {
+  google.protobuf.DoubleValue lookback = 1;
+}
+
 // MonoVertexDaemonService is a grpc service that is used to provide APIs for giving any MonoVertex information.
 service MonoVertexDaemonService {
 
@@ -59,4 +63,8 @@ service MonoVertexDaemonService {
     option (google.api.http).get = "/api/v1/status";
   };
 
+  rpc GetMonoVertexLookback (google.protobuf.Empty) returns (GetMonoVertexLookbackResponse) {
+    option (google.api.http).get = "/api/v1/lookback";
+  };
+
 }