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- Allows to encode "not set" states for single members

Should not break CPU sensor instatiation anymore
Invalidates commit 1a5e05a7

- Sensor/Group overwriting broke CPU sensor instantiation
- Looking for a more robust solution

- Prevented instantiating sensors from templates within template groups

Pusher SensorGroupTemplate: Also replace partial template specialization with derived SensorGroupTemplate for entities

Pusher: Refactor ConfiguratorTemplate once again. Replace partial template specialization with derived ConfiguratorTemplate for entities

- The interval field now defaults to the value inherited from the
sensor groups that the sensor belongs to
- Metadata blocks in templates can now be overwritten completely or
only in part

- Also added a "pattern" field to SensorMetadata class for consistency
with the DCDB::PublicSensor class

- Data is correctly parsed from DCDBPusher, sent as JSON, and received
by collectagents
- Integration in libdcdb is still pending

- Removed automatic assignment of sensor names to MQTT topics and vice
versa if either is empty
- All boolean checks now use the to_bool function

- Fixed a bug that prevented pipelines in collectagent deployments
- Incremented the tolerance threshold of fuzzy queries to 1h
- Fixed the assignment of MQTT topics to job sensors

Create sensor names from mqttsuffix if not configured otherwise and vice versa. For sensor groups that use entities, create group name from entity name if not configured otherwise.

- If a subSampling value of 0 or lower is chosen for a sensor, it will
never be pushed out over MQTT/Cassandra and only kept in memory

- Integrated changes to the stop mechanism
- Also re-worked the interface to have the same execOn* methods as Sensor Groups

- Decoupled the stop() and wait() methods
- A stop command is issued to all sensor groups, then a wait is performed
- Wait() now does busy waiting at a 10ms frequency and times out based
on the interval of the sensor group

- This plugin allows to write arbitrary sensor data to the local file system
- Removed the obsolete sink functionality in SensorBase
- Also fixed a minor bug concerning MQTT topic assignment in template analyzers

- use std::atomic_flag based spin lock for thread safety
- minor fixes and improvements