Handle partial failures in Google Ads API batch mutate operations

Steps

1. Set partial_failure to true in your MutateAsync or batch mutate request; this allows successful operations in the batch to be applied even when others fail.
2. Check the top-level partial_failure_error field in the response; a non-null value indicates that at least one operation in the batch failed.
3. Iterate over the mutate_operations results and examine each result's status; failed operations return an error in the result's error field, while successful ones return the resource name or ID.
4. Decode the partial_failure_error using the GoogleAdsFailure proto to extract individual GoogleAdsError objects, each containing an error_code, message, and the operation_index identifying which input operation failed.
5. Log the operation_index alongside the original request payload so you can identify and resubmit the failed items without re-processing successful ones.
6. Do not retry the entire batch after a partial failure; extract only the failed operations by operation_index and submit them as a separate batch to avoid creating duplicates of already-successful operations.