Checkmk Werk 15737: <tt>docker_node_info</tt>: Fix sporadic UNKN if host is monitored by multiple sites

ID: 15737 Title: <tt>docker_node_info</tt>: Fix sporadic UNKN if host is monitored by multiple sites Component: Checks & agents Level: 1 Class: Bug fix Version: 2.3.0b1 In case a Docker host with installed Docker agent plugin (<tt>mk_docker</tt>) was monitored by multiple Checkmk sites, the <i>Docker node info</i> service might have sporadically reported UNKN with the following error message: C+: 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' C-: To benefit from this werk, users have to re-deploy the Docker agent plugin on affected hosts.