[njhill]

Introduced in #17546. We should only call mark_process_dead when we're using prometheus multiprocessing mode (with > 1 API servers).

ERROR 05-31 01:04:14 [prometheus.py:77] Error during metrics cleanup: expected str, bytes or os.PathLike object, not NoneType

Thanks to @lgeiger for reporting.

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[houseroad]

Looks good.