~/brew/etc/prometheus.args

--storage.tsdb.retention

Default macOS

--config.file /Users/user/brew/etc/prometheus.yml
--web.listen-address=127.0.0.1:9090
--storage.tsdb.path /Users/user/brew/var/prometheus

Storage options

 #  --storage.tsdb.path="/var/lib/prometheus/metrics2/"
#                             Base path for metrics storage.
#  --storage.tsdb.min-block-duration=2h
#                             Minimum duration of a data block before being
#                             persisted.
#  --storage.tsdb.max-block-duration=<duration>
#                             Maximum duration compacted blocks may span.
#                             (Defaults to 10% of the retention period)
#  --storage.tsdb.retention=15d
#                             How long to retain samples in the storage.
#  --storage.tsdb.no-lockfile
#                             Do not create lockfile in data directory.

prometheus.yml, /etc/default/prometheus, prometheus.args, job_name:, targets:, Prometheus service discovery