Introduce support for error specific retry policy overrides

temporal/api/common/v1/message.proto

@@ -92,6 +92,24 @@ message ActivityType {
     string name = 1;
 }
 
+// Backoff setting for a specific error. This message is designed to be used as a value
+// of error backoff overrides in the RetryPolicy message.
+message BackoffSettings {
+    // Interval of the first retry. If retryBackoffCoefficient is 1.0 then it is used for all retries.
+    google.protobuf.Duration initial_interval = 1 [(gogoproto.stdduration) = true];
+    // Coefficient used to calculate the next retry interval.
+    // The next retry interval is previous interval multiplied by the coefficient.
+    // Must be 1 or larger.
+    double backoff_coefficient = 2;
+    // Maximum interval between retries. Exponential backoff leads to interval increase.
+    // This value is the cap of the increase. Default is 100x of the initial interval.
+    google.protobuf.Duration maximum_interval = 3 [(gogoproto.stdduration) = true];
+    // Maximum number of attempts. When exceeded the retries stop even if not expired yet.
+    // 1 disables retries. 0 means unlimited (up to the timeouts)
+    int32 maximum_attempts = 4;
+}
+
+
 // How retries ought to be handled, usable by both workflows and activities
 message RetryPolicy {
     // Interval of the first retry. If retryBackoffCoefficient is 1.0 then it is used for all retries.
@@ -109,6 +127,9 @@ message RetryPolicy {
     // Non-Retryable errors types. Will stop retrying if the error type matches this list. Note that
     // this is not a substring match, the error *type* (not message) must match exactly.
     repeated string non_retryable_error_types = 5;
+    // Customize backoff settings for specific errors.
+    // Similar to 'Non-Retryable', the key should precisely match the error *type*.
+    map<string, BackoffSettings> error_backoff_overrides = 6;
 }
 
 // Metadata relevant for metering purposes