metrics property
Metrics replaces the live sample, and sending one IS A HEARTBEAT: the server stamps the time and appends the point to the fleet series. Sending an all-zero sample CLEARS the heartbeat — the machine goes back to having no liveness fact at all, and its stored status is taken at face value again.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
Metrics? metrics;