# Percona Monitoring and Management 2.15.1
Percona Monitoring and Management (PMM) is a free and open-source platform for managing and monitoring MySQL, MongoDB, and PostgreSQL performance.
## Release Highlights
This patch release fixes performance issues discovered in systems, together with other small fixes.
## Bugs Fixed
- [PMM-7635](https://jira.percona.com/browse/PMM-7635): Fix high CPU consumption by Grafana server after upgrade by docker replacement to 2.15.0 with large numbers of services in 'push' mode.
- [PMM-7713](https://jira.percona.com/browse/PMM-7713): Fix high CPU and Memory consumption by Victoria Metrics after upgrade by docker replacement to 2.15.0 with large numbers of services in 'pull' mode.
- [PMM-7470](https://jira.percona.com/browse/PMM-7470): MongoDB exporter `IndexStatsCollections` is assigned values from wrong flag (intended for 2.15.0, omitted due to missing merge cutoff) (Thanks to Tim for reporting this issue).
- [PMM-1531](https://jira.percona.com/browse/PMM-1531): Metrics not being collected due to rename of MySQL 8 information schema tables.