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The Nomad client can now optionally emit telemetry data from the prerun and prestart hooks. This allows operators to monitor and alert on failures and time taken to complete. The new datapoints are: - nomad.client.alloc_hook.prerun.success (counter) - nomad.client.alloc_hook.prerun.failed (counter) - nomad.client.alloc_hook.prerun.elapsed (sample) - nomad.client.task_hook.prestart.success (counter) - nomad.client.task_hook.prestart.failed (counter) - nomad.client.task_hook.prestart.elapsed (sample) The hook execution time is useful to Nomad engineering and will help optimize code where possible and understand job specification impacts on hook performance. Currently only the PreRun and PreStart hooks have telemetry enabled, so we limit the number of new metrics being produced.