- [InfluxDB](https://github.com/swarmstack/influxdb) - Useful for longer-term Prometheus storage/retrieval in certain workloads

The data retention period for Prometheus is defaulted to 48 hours within the docker compose files, and a default 10GB Prometheus tsdb data volume will be created for HA swarmstack users. Prometheus itself is not designed for long-term storage and retrival of data, but can work with several storage back-ends as remote-read and remote-write targets. If you find that you need to perform queries on metrics data older than a few days, you should explore deploying other options for long-term storage and retrieval of Prometheus data. Prometheus can optionally replicate metrics stored within it's own internal time-series database (tsdb) out to one or more external tsdb such as InfluxDB and supports efficient remote-read and write from these longer-term storage sources.

InfluxDB and Postgres (even streaming read-replication) can be used to persist metrics data in a way that Prometheus can consume it, other [storage back-ends for Prometheus](https://prometheus.io/docs/operating/integrations/) are also available. The project [swarmstack/influxdb](https://github.com/swarmstack/influxdb) can help swarmstack users quickly bring up an optional InfluxDB remote read-write back-end for hosting longer-term Prometheus metrics.