* Refactor trigger
* Refactor HealthMonitor.php to make Timer property readonly
* Refactor HealthMonitor.php to make Timer property readonly
* Refactor Consumer.php to use null-safe operator for health monitor process
* Refactor Consumer.php constructor to use null-safe operator for health monitor process
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Co-authored-by: Deeka Wong <8337659+huangdijia@users.noreply.github.com>