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Updating core configuration...
Generating configuration for core (type cmc)...
Configuration Error: Error creating configuration: 'cmk.influxdb'
Could not update core configuration. Aborting.

OMD[mysite]:~$ cmk --debug -vvU
Trying to acquire lock on /omd/sites/mysite/etc/check_mk/main.mk
Got lock on /omd/sites/mysite/etc/check_mk/main.mk
Generating configuration for core (type cmc)...
Trying to acquire lock on /omd/sites/mysite/var/check_mk/core/helper_config/serial.mk
Got lock on /omd/sites/mysite/var/check_mk/core/helper_config/serial.mk
Releasing lock on /omd/sites/mysite/var/check_mk/core/helper_config/serial.mk
Released lock on /omd/sites/mysite/var/check_mk/core/helper_config/serial.mk
Trying to acquire lock on /omd/sites/mysite/var/check_mk/licensing/licensed_state
Got lock on /omd/sites/mysite/var/check_mk/licensing/licensed_state
Releasing lock on /omd/sites/mysite/var/check_mk/licensing/licensed_state
Released lock on /omd/sites/mysite/var/check_mk/licensing/licensed_state

Releasing lock on /omd/sites/mysite/etc/check_mk/main.mk
Released lock on /omd/sites/mysite/etc/check_mk/main.mk
Configuration Error: 'cmk.influxdb'
Trying to acquire lock on /omd/sites/mysite/var/check_mk/crashes/base/cfd7aef2-4734-11ee-a2f4-90e2bae2d00c/crash.info
Got lock on /omd/sites/mysite/var/check_mk/crashes/base/cfd7aef2-4734-11ee-a2f4-90e2bae2d00c/crash.info
Releasing lock on /omd/sites/mysite/var/check_mk/crashes/base/cfd7aef2-4734-11ee-a2f4-90e2bae2d00c/crash.info
Released lock on /omd/sites/mysite/var/check_mk/crashes/base/cfd7aef2-4734-11ee-a2f4-90e2bae2d00c/crash.info
Traceback (most recent call last):
  File “/omd/sites/mysite/bin/cmk”, line 112, in <module>
    exit_status = modes.call(mode_name, mode_args, opts, args)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File “/omd/sites/mysite/lib/python3/cmk/base/modes/__init__.py”, line 68, in call
    return handler(*handler_args)
           ^^^^^^^^^^^^^^^^^^^^^^
  File “/omd/sites/mysite/lib/python3/cmk/base/modes/check_mk.py”, line 1218, in mode_update
    do_create_config(
  File “/omd/sites/mysite/lib/python3/cmk/base/core_config.py”, line 271, in do_create_config
    _create_core_config(
  File “/omd/sites/mysite/lib/python3/cmk/base/core_config.py”, line 359, in _create_core_config
    core.create_config(config_path, config_cache, hosts_to_update=hosts_to_update)
  File “/omd/sites/mysite/lib/python3/cmk/base/core_config.py”, line 79, in create_config
    self._create_config(config_path, config_cache, licensing_handler, hosts_to_update)
  File “/omd/sites/mysite/lib/python3/cmk/base/cee/microcore_config.py”, line 3215, in _create_config
    data = create_core_config(
           ^^^^^^^^^^^^^^^^^^^
  File “/omd/sites/mysite/lib/python3/cmk/base/cee/microcore_config.py”, line 3134, in create_core_config
    data[“globals”] = _serialize_config_globals(string_pool, serial)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File “/omd/sites/mysite/lib/python3/cmk/base/cee/microcore_config.py”, line 545, in _serialize_config_globals
    _fill_influx_db(gl, string_pool)
  File “/omd/sites/mysite/lib/python3/cmk/base/cee/microcore_config.py”, line 420, in _fill_influx_db
    influx_db.log_level = _to_log_level(base_config.cmc_log_levels["cmk.influxdb”])
                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
KeyError: 'cmk.influxdb'

Not supported: It is also possible to change the values with CLI. 

vi ~/etc/check_mk/conf.d/wato/sitespecific.mk

# Set log levels to default.
# Add 'cmk.influxdb': 5, if not configured in sitespecific.mk

cmc_log_levels = {'cmk.alert': 5,
 'cmk.carbon': 5,
 'cmk.core': 5,
 'cmk.downtime': 5,
 'cmk.helper': 5,
 'cmk.influxdb': 5,
 'cmk.livestatus': 5,
 'cmk.notification': 5,
 'cmk.rrd': 5,
 'cmk.smartping': 5}