Werk #17782: Fixes for "Processing of piggybacked host data" rule
| Component | Setup | ||||
| Title | Fixes for "Processing of piggybacked host data" rule | ||||
| Date | Mar 18, 2025 | ||||
| Level | Trivial Change | ||||
| Class | Bug Fix | ||||
| Compatibility | Compatible - no manual interaction needed | ||||
| Checkmk versions & editions |
|
The rule "Processing of piggybacked host data" allows for configuring time parameters related to the processing of piggyback data. The option "Exemptions for piggybacked hosts (VMs, ...)" can be used to configure specific values for certain hosts only. Werk 10491 added the option to use regular expressions for restricting the set of piggybacked hosts to which the exemptions apply.
As described in the werk, to make Checkmk interpret a configured value as a regular expression, it has to be prefixed with "~". Since this mechanism is quite intransparent for users, the rule configuration page now offers an explicit dropdown to select if a value should be interpreted as a regular expression or as a hostname. In case the former option is selected, no leading "~" is needed anymore. In case the latter option is selected, the input must be a valid Checkmk hostname, since invalid hostnames would anyway never match.
When updating, existing rules will be migrated automatically. Configurations with values prefixed with "~" are migrated to explicit regular expressions. All other values are migrated to explicit hostnames, whereby invalid values are dropped. This does not induce a change in behavior, since such configurations anyway never matched.
Furthermore, this werk also fixes an error during a Checkmk update. In case users had configured
values such as ^test.* that were meant to be interpreted as regular expression but did not start
with "~", the update might have failed with errors such as
-| Generating configuration for core (type cmc)...
-| Starting full compilation for all hosts Creating global helper config...OK
-| Creating cmc protobuf configuration...Configuration Error: Error creating configuration: Traceback (most recent call last):
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 2176, in _hosts_worker
-| hosts_data = _compute_worker_hosts_data(
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 2064, in _compute_worker_hosts_data
-| helper_config_manager.get_host_data(
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 3043, in get_host_data
-| host_class(config_cache, hostname, hosts_config, passwords, ip_address_of),
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 1315, in __init__
-| super().__init__(
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 1046, in __init__
-| self._compute()
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 1349, in _compute
-| self._info = self._process_host_config_block(
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/cee/microcore_config.py", line 1263, in _process_host_config_block
-| use_piggyback=self._config_cache.is_piggyback_host(self._hostname),
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/config.py", line 2347, in is_piggyback_host
-| return self.__is_piggyback_host.setdefault(host_name, get_is_piggyback_host())
-| ^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/config.py", line 2342, in get_is_piggyback_host
-| return self._has_piggyback_data(host_name)
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/base/config.py", line 3181, in _has_piggyback_data
-| self._host_has_piggyback_data_right_now(host_name)
-| File "/omd/sites/bar/lib/python3/cmk/base/config.py", line 3195, in _host_has_piggyback_data_right_now
-| piggy_config = piggyback_backend.Config(host_name, time_settings)
-| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/piggyback/backend/_config.py", line 45, in __init__
-| self._expanded_settings = {
-| ^
-| File "/omd/sites/bar/lib/python3/cmk/piggyback/backend/_config.py", line 64, in _normalize_pattern
-| yield HostAddress(expr)
-| ^^^^^^^^^^^^^^^^^
-| File "/omd/sites/bar/lib/python3/cmk/utils/hostaddress.py", line 121, in __new__
-| cls.validate(text)
-| File "/omd/sites/bar/lib/python3/cmk/utils/hostaddress.py", line 68, in validate
-| HostAddress.validate_hostname(text)
-| File "/omd/sites/bar/lib/python3/cmk/utils/hostaddress.py", line 89, in validate_hostname
-| raise ValueError(f"Invalid hostaddress: {text!r}")
-| ValueError: Invalid hostaddress: '^test.*'