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Werk #11997: mk_docker.py: Handle parallel calls of the plugin

Component Checks & agents
Title mk_docker.py: Handle parallel calls of the plugin
Date Jan 25, 2021
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
2.0.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The docker API will not allow parallel calls to its 'df' command. Since this command is notoriously long running, the section 'docker_node_disk_usage' was often missing if the agent has been called multiple times in parallel.

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