Gnocchi uses two databases: One for incoming measures, which it receives from Ceilometer when it runs in an OpenStack cloud, and one for aggregates. The [incoming] section in gnocchi.conf configures storage of incoming measures, and the [storage] section configures storage of aggregates.

According to the published config file, by default the incoming storage driver is identical to the aggregate storage driver:

[incoming]

#
# From gnocchi
#
# Storage driver to use (string value)
#driver = ${storage.driver}

The default [storage] driver is file, but you use redis. I have a Rocky Devstack, which also configures redis. I tried to understand the redis config file /etc/redis/redis.conf but am not sure which persistence method is actually configured. However, the default seems to be RDB, and there is a file /var/lib/redis/dump.rdb whose ever-changing timestamp proves that it is being used.

Most probably, then, your incoming measures and aggregates are stored in /var/lib/redis/dump.rdb.