App-metrics are currently planned to be stored in postgres. During the POC timescaledb was used to integrate with prometheus but getting timescaledb running in openshift is difficult.

• The official timescaledb docker image runs as root so is not suitable for openshift
• There is an rhscl image for postgres 9.6 which timescale requires but the installation process for timescaledb is non-trivial and would require additions to the rhscl image
• An option would be to extend the rhscl image ( https://github.com/sclorg/postgresql-container/tree/master/latest#extending-image ) but again this is non-trivial and requires investigation