You may determine your application as stateless, because datastore function is handled by another pod or system. However, there are some pitfalls that sometimes applications actually store important files that you aren't aware of. For example, Grafana (https://grafana.com/grafana), it connects time series datasources such as Graphite (https://graphiteapp.org) and InfluxDB (https://www.influxdata.com/time-series-database/), so that people may determine whether Grafana is a stateless application.
However, Grafana itself also uses databases to store the user, organization, and dashboard metadata. By default, Grafana uses SQLite3 components and stores the database as /var/lib/grafana/grafana.db ...
