Hey folks.
I am setting up multi-process mode for my application and wanted to if it
is necessary to call mark_process_dead if my project does not use gauges.
Based on the prometheus source code it looks like mark_process_dead only
removes the files related to the live gauge metric.
```
def mark_process_dead(pid, path=None):
"""Do bookkeeping for when one process dies in a multi-process setup."""
if path is None:
path = os.environ.get('PROMETHEUS_MULTIPROC_DIR',
os.environ.get('prometheus_multiproc_dir'))
for mode in _LIVE_GAUGE_MULTIPROCESS_MODES:
for f in glob.glob(os.path.join(path, f'gauge_{mode}_{pid}.db')):
os.remove(f)
```
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