[dvlsg]

Depending on your expected traffic patterns and volume, no responses to report for an extended period of time is its own data point.

[hinkley]

In the old days when telemetry was exotic this was the answer.

No 2XX-499 results means the server is borked.

If you wanted to be really fancy you could send heartbeat requests when no live traffic had hit that node for n milliseconds.

I still think the latter is the right answer. Why inflate traffic when you are horizontally scaling? That’s a lot of health checks per second.