[metricbeat] Remove deprecated system.hostfs setting - #52238
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khushijain21 wants to merge 5 commits into
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[metricbeat] Remove deprecated system.hostfs setting #52238khushijain21 wants to merge 5 commits into
system.hostfs setting #52238khushijain21 wants to merge 5 commits into
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system.hostfs setting
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July 24, 2026 10:42
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orestisfl
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Do we want to introduce this breaking change mid-9.x instead of waiting for 10.0? Is this a strong blocker for something?
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This setting was deprecated in 8.0.0 . See. I believed it is safe to remove it in 9.x. It is not a strong blocker. I came across this while testing a bug and hence wanted to clean this up. |
belimawr
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I'm fine with the change as along as it goes into a minor release. We should not be changing behaviour in a patch release.
| The process metricset supports both V1 and V2 (sometimes called unfied) cgroups controllers. However, on systems that are running a hybrid hierarchy, with both V1 and V2 controllers, metricbeat will only report one of the hierarchies for a given process. Is a process has both V1 and V2 hierarchies associated with it, metricbeat will check to see if the process is attached to any V2 controllers. If it is, it will report cgroups V2 metrics. If not, it will report V1 metrics. | ||
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| A workaround is also required if metricbeat is running inside docker on a hybrid system. Within docker, metricbeat won’t be able to see any V2 cgroups components. If you wish to monitor cgroups V2 from within docker on a hybrid system, you must mount the unified sysfs hierarchy (usually `/sys/fs/cgroups/unified`) inside the container, and then use `system.hostfs` to specify the filesystem root within the container. | ||
| A workaround is also required if metricbeat is running inside docker on a hybrid system. Within docker, metricbeat won’t be able to see any V2 cgroups components. If you wish to monitor cgroups V2 from within docker on a hybrid system, you must mount the unified sysfs hierarchy (usually `/sys/fs/cgroups/unified`) inside the container, and then use `hostfs` to specify the filesystem root within the container. |
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We need to make explicit about which version system.hostfs stops accepting.
| The process metricset supports both V1 and V2 (sometimes called unfied) cgroups controllers. However, on systems that are running a hybrid hierarchy, with both V1 and V2 controllers, metricbeat will only report one of the hierarchies for a given process. Is a process has both V1 and V2 hierarchies associated with it, metricbeat will check to see if the process is attached to any V2 controllers. If it is, it will report cgroups V2 metrics. If not, it will report V1 metrics. | ||
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| A workaround is also required if metricbeat is running inside docker on a hybrid system. Within docker, metricbeat won’t be able to see any V2 cgroups components. If you wish to monitor cgroups V2 from within docker on a hybrid system, you must mount the unified sysfs hierarchy (usually `/sys/fs/cgroups/unified`) inside the container, and then use `system.hostfs` to specify the filesystem root within the container. | ||
| A workaround is also required if metricbeat is running inside docker on a hybrid system. Within docker, metricbeat won’t be able to see any V2 cgroups components. If you wish to monitor cgroups V2 from within docker on a hybrid system, you must mount the unified sysfs hierarchy (usually `/sys/fs/cgroups/unified`) inside the container, and then use `hostfs` to specify the filesystem root within the container. |
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Proposed commit message
system.hostfssetting has been deprecated long ago in favor ofhostfsfield. See PR #29138This PR removes it.
Disruptive User Impact
Existing users using legacy config will have to migrate to the new one