Allow client to suggest delay until next retry

temporal/api/failure/v1/message.proto

@@ -31,13 +31,20 @@ option java_outer_classname = "MessageProto";
 option ruby_package = "Temporalio::Api::Failure::V1";
 option csharp_namespace = "Temporalio.Api.Failure.V1";
 
+import "google/protobuf/duration.proto";
+
 import "temporal/api/common/v1/message.proto";
 import "temporal/api/enums/v1/workflow.proto";
 
 message ApplicationFailureInfo {
     string type = 1;
     bool non_retryable = 2;
     temporal.api.common.v1.Payloads details = 3;
+    // next_retry_delay can be used by the client to override activity retry
+    // interval instead of one calculated by the retry policy set by workflow.
+    // Retry attempt still will be a subject to max retries limit and total
+    // time limit defined by the policy.
+    google.protobuf.Duration next_retry_delay = 4;
 }
 
 message TimeoutFailureInfo {