I’m seeing a similar increase in runtime in CRE too, but no non-resolvable IPs in my case.
My log:
OMD[zdv]:~$ cmk --debug -vvR | ts '[%Y-%m-%d %H:%M:%S]'
[2022-08-09 13:41:24] Trying to acquire lock on /omd/sites/zdv/etc/check_mk/main.mk
[2022-08-09 13:41:24] Got lock on /omd/sites/zdv/etc/check_mk/main.mk
[2022-08-09 13:41:24] Generating configuration for core (type nagios)...
[2022-08-09 13:41:24] Trying to acquire lock on /omd/sites/zdv/var/check_mk/core/helper_config/serial.mk
[2022-08-09 13:41:24] Got lock on /omd/sites/zdv/var/check_mk/core/helper_config/serial.mk
[2022-08-09 13:41:24] Releasing lock on /omd/sites/zdv/var/check_mk/core/helper_config/serial.mk
[2022-08-09 13:41:24] Released lock on /omd/sites/zdv/var/check_mk/core/helper_config/serial.mk
[2022-08-09 13:44:03] Trying to acquire lock on /omd/sites/zdv/etc/nagios/conf.d/check_mk_objects.cfg
[2022-08-09 13:44:03] Got lock on /omd/sites/zdv/etc/nagios/conf.d/check_mk_objects.cfg
[2022-08-09 13:44:03] Releasing lock on /omd/sites/zdv/etc/nagios/conf.d/check_mk_objects.cfg
[2022-08-09 13:44:03] Released lock on /omd/sites/zdv/etc/nagios/conf.d/check_mk_objects.cfg
[2022-08-09 13:44:03] Precompiling host checks...Creating precompiled host check config...
[2022-08-09 13:44:03]webstats-01 : Precompiling host checks...
cmk.base.plugins.agent_based.apt cmk.base.plugins.agent_based.arbor_peakflow_sp cmk.base.plugins.agent_based.arbor_peakflow_tms cmk.base.plugins.agent_based.arbor_pravail cmk.base.plugins.agent_based.check_mk cmk.base.plugins.agent_based.checkmk_agent cmk.base.plugins.agent_based.checkmk_agent_plugins cmk.base.plugins.agent_based.chrony cmk.base.plugins.agent_based.cmk_agent_ctl_status cmk.base.plugins.agent_based.cpu cmk.base.plugins.agent_based.cpu_load cmk.base.plugins.agent_based.cpu_threads cmk.base.plugins.agent_based.datapower_tcp cmk.base.plugins.agent_based.df_section cmk.base.plugins.agent_based.diskstat cmk.base.plugins.agent_based.diskstat_statgrab_section cmk.base.plugins.agent_based.docker_container_diskstat cmk.base.plugins.agent_based.docker_container_diskstat_cgroupv2 cmk.base.plugins.agent_based.docker_container_mem cmk.base.plugins.agent_based.docker_container_mem_cgroupv2 cmk.base.plugins.agent_based.fileinfo cmk.base.plugins.agent_based.hpux_cpu cmk.base.plugins.agent_based.hr_mem cmk.base.plugins.agent_based.kernel cmk.base.plugins.agent_based.kube_uptime cmk.base.plugins.agent_based.lnx_bonding cmk.base.plugins.agent_based.lnx_if cmk.base.plugins.agent_based.local cmk.base.plugins.agent_based.logwatch cmk.base.plugins.agent_based.logwatch_section cmk.base.plugins.agent_based.mcafee_emailgateway_cpuload cmk.base.plugins.agent_based.mem cmk.base.plugins.agent_based.mem_used_sections cmk.base.plugins.agent_based.mobileiron_section cmk.base.plugins.agent_based.mrpe cmk.base.plugins.agent_based.mysql_capacity cmk.base.plugins.agent_based.ntp cmk.base.plugins.agent_based.ovs_bonding cmk.base.plugins.agent_based.ps_check cmk.base.plugins.agent_based.ps_section cmk.base.plugins.agent_based.snmp_uptime cmk.base.plugins.agent_based.statgrab_load cmk.base.plugins.agent_based.systemd_units cmk.base.plugins.agent_based.tcp_conn_stats cmk.base.plugins.agent_based.ucd_cpu_load cmk.base.plugins.agent_based.uptime cmk.base.plugins.agent_based.windows_intel_bonding cmk.base.plugins.agent_based.windows_os_bonding cmk.base.plugins.agent_based.winperf_tcp_conn apt burp cfengine3 debian_lts_status df kernel.performance logfiles mem.linux mounts multipath mysql mysql.connections mysql.innodb_io mysql.sessions mysql.status mysql_ping nfsmounts[2022-08-09 13:44:03] Trying to acquire lock on /omd/sites/zdv/var/check_mk/core/helper_config/491/host_checks/webstats-01.py
[2022-08-09 13:44:03] Got lock on /omd/sites/zdv/var/check_mk/core/helper_config/491/host_checks/webstats-01.py
[2022-08-09 13:44:03] Releasing lock on /omd/sites/zdv/var/check_mk/core/helper_config/491/host_checks/webstats-01.py
[2022-08-09 13:44:03] Released lock on /omd/sites/zdv/var/check_mk/core/helper_config/491/host_checks/webstats-01.py
==> /omd/sites/zdv/var/check_mk/core/helper_config/491/host_checks/webstats-01.
[...]
[2022-08-09 13:44:07] OK
[2022-08-09 13:44:07] Running '/omd/sites/zdv/bin/nagios -vp /omd/sites/zdv/tmp/nagios/nagios.cfg'
[2022-08-09 13:44:07] Validating Nagios configuration...OK
[2022-08-09 13:44:25] Restarting monitoring core...OK
[2022-08-09 13:44:25] Releasing lock on /omd/sites/zdv/etc/check_mk/main.mk
[2022-08-09 13:44:25] Released lock on /omd/sites/zdv/etc/check_mk/main.mk
What’s happening in those nearly three minutes in the beginning?