Werk #15737: docker_node_info: Fix sporadic UNKN if host is monitored by multiple sites

Component	Checks & agents
Title	docker_node_info: Fix sporadic UNKN if host is monitored by multiple sites
Date	May 12, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p36 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In case a Docker host with installed Docker agent plugin (mk_docker) was monitored by multiple Checkmk sites, the Docker node info service might have sporadically reported UNKN with the following error message:

Plugin exception in section_node_disk_usage: [Errno 2] No such file or directory: '/var/lib/check_mk_agent/mk_docker_df.tmp....' -> '/var/lib/check_mk_agent/mk_docker_df.spool'

To benefit from this werk, users have to re-deploy the Docker agent plugin on affected hosts.

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