Major Description
The current implementation of the HealthCheck based updates has a backward incompatibility issue when the HealthCheckConfig is used in such a way that the initial grace period is extended beyond the `initial_interval_secs`.
This bug prematurely fails updates by using the new fail-fast feature when the `initial_interval_secs` does not count for the entire task warmup time.
In the older version the actual grace period for update to succeed was `initial_interval_secs + interval_secs * max_consecutive_failures`.