Support engine events and detect config watcher failed #1107
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Description
Creates a new
events
file for events at engine scope, in addition to per-core engine workers. Updates event reader to include these events as well so they are all picked up automatically by telemetry exporters.Detect when
FileSystem.newWatchService()
fails, and record engine event, then still continue startup with observedzilla.yaml
configuration.Fixes #1081