System self-monitoring

System health evaluation is performed by Policy Engine running on the Hub. The evaluation is based on a set of rules called policies.

Each policy is responsible for searching for a particular issue in data collected in Monitoring Data Cache and when it finds it, it performs issue recovery.

Policies are also responsible for raising and closing alerts via Alerts Engine. Policies can be stateful, that is they can keep local data available between evaluations. This can be used for tracking in-progress actions requested by a policy, storing information about sent alerts etc.

Each policy has access to complete monitoring data. Policies run only when Platform Manager is in state ACTIVE.