Percona Monitoring and Management 2.44.0

Percona Monitoring and Management (PMM) is an open source database monitoring, management, and observability solution for MySQL, PostgreSQL, and MongoDB.

It enables you to observe the health of your database systems, explore new patterns in their behavior, troubleshoot them, and execute database management operations regardless of whether your databases are located on-premises or in the cloud.

Support for version 8.0 of Percona Server for MongoDB (PSMDB), MongoDB Community, and MongoDB Enterprise

The latest version of MongoDB Community edition, along with the upcoming PSMDB 8.0, introduce numerous improvements and significant performance enhancements.

We have updated PMM 2 to include support for these new versions, including changes to mongodb_exporter to accommodate the revised metrics structure (e.g., wiredTiger.concurrentTransactions is now queues.execution).

The MongoDB Oplog Details dashboard has also been adapted to support MongoDB 8.0's new oplog metrics, with updated panels for Oplog Buffered Operations and Buffer Capacity.

!!! hint alert alert-success "Important notes"
- This enhancement requires PMM Agent version 2.43.1 or later.

- MongoDB 8.0 introduces significant changes to its internal metrics structure. While we have updated PMM’s built-in dashboards to reflect these changes, you may need to update any custom dashboards to align with the new metrics.

- When using the `--enable-all-collectors` flag, monitor memory usage carefully with MongoDB clusters, especially in sharded environments with multiple collections. If you frequently create new collections or work with many collections, disable the `collstats` collector to prevent memory consumption issues.

Improved PostgreSQL 17 metrics collection

PMM 2.44.0 strengthens monitoring capabilities for PostgreSQL 17, building on the recent support for Query Analytics (QAN) introduced in PMM 2.43.2.

This previous release updated field names for PostgreSQL 17 compatibility (e.g., blk_read_time to shared_blk_read_time).

This release further enhances PostgreSQL monitoring with updated queries aligned with PostgreSQL 17's schema changes to ensure accurate metrics collection in the PostgreSQL Instances Overview dashboard.

We've also improved collector support, including proper recognition of PostgreSQL 17 columns like checkpoints_timed in the stat_bgwriter collector.

Fixed metrics collection for MongoDB backups

We've resolved an issue where Percona Backup for MongoDB (PBM) metrics were not being scraped by default and required the --enable-all-collectors flag.

With this fix, PBM metrics are now automatically collected when MongoDB services are added to PMM, without requiring additional configuration.

However, PBM metrics collection is disabled for PMM Clients 2.43.0 and 2.43.1 due to a memory leak identified in these versions. This functionality is supported starting with PMM Client 2.43.2 and later.