feat: telemetry - loop duration & delay

[bajtos]

Monitor how long each loop takes to finish and what's the delay before the next
iteration, so that we can alert when things become too slow.

[bajtos]

I created a new Grafana panel, configured an alert when the iteration takes longer than 60% of the interval between iterations, and disabled the CPU throttling alert.

[bajtos]

Unfortunately, the alert does not work 😠

The composer UI shows that all is good. But when the Grafana alerting system runs, it reports the following error:

Something went wrong when evaluating this alert rule
invalid format of evaluation results for the alert definition : frame cannot uniquely be identified by its labels: has duplicate results with labels {}

I searched the internet but could not find any useful answer. This is such a waste of time. I decided to re-enable the cpu-throttling alert and pause the new one.