When a worker is terminated with kill -9 (for example, suprevisor can terminate workers with SIGKILL), the workhorse will continue running.

Workhorse may finish or fail. In both cases it will execute some stats methods:

• Worker.increment_successful_job_count()
• Worker.increment_failed_job_count()
• Worker.increment_total_working_time()

These methods will execute redis HINCRBY and HINCRBYFLOAT on a non-existent key of terminated worker (redis key of worker is deleted by TTL), for absent key redis will set the standard ttl -1and that key will become immortal.`

A check could be added to see if the worker still exists before updating the stats.