Increase max instances (#964)

Author: stephen-soltesz

cmd/etl_worker/app-batch.yaml

@@ -21,7 +21,7 @@ resources:
 automatic_scaling:
   # This is intended for batch jobs.
   min_num_instances: 4
-  max_num_instances: 6
+  max_num_instances: 12
   # Very long cool down period, to reduce the likelihood of tasks being truncated.
   cool_down_period_sec: 1800
   # We don't care much about latency, so a high utilization is desireable.