[Release] Checkmk stable release 1.6.0p22

Dear friends of Checkmk,

the new stable release 1.6.0p22 of Checkmk is ready for download.

This maintenance release ships with 9 changes affecing all editions of Checkmk,
1 Enterprise Edition specific changes and 0 Managed Services Edition specific

The most important functional fix in this version is the update of NagVis.
Checkmk 1.6.0p21 delivered a NagVis version that could lead to broken map
configurations under certain circumstances.

Changes in all Checkmk Editions:

Checks & agents:

  • 11844 SEC: Windows agent internal communication channel is secure now
  • 12119 FIX: docker_container_cpu check accepts cgroup v2 values
  • 11728 FIX: zfsget: handle datasets with no available space correctly

Core & setup:

  • 11942 FIX: webapi: fix TypeError when formatting tags

Other components:

  • 12132 FIX: NagVis: Fix incompatibility with PHP 7.4 or newer
  • 12126 FIX: NagVis: Updated to 1.9.25


  • 12232 FIX: Error reporting in downtime script (treasures)

User interface:

  • 11791 FIX: First column in single dataset layout of views consumed too much space
  • 12071 FIX: Fix default active time range on iCalendar timeperiod imports
    NOTE: Please refer to the migration notes!

Changes in the Checkmk Enterprise Edition:

Core & setup:

  • 11905 FIX: Restore event helper time out to 3s

Changes in the Checkmk Managed Services Edition:


You can download Checkmk from our download page:

Please mail bug reports and qualified feedback to feedback@checkmk.com.
We greatly thank you for using Checkmk and wish you a successful monitoring,

Your Checkmk Team