Merge branch 'master' into feature/kustomize

...in/java/theodolite/uc2/application/ConfigurationKeys.java

...theodolite/uc2/streamprocessing/JointFlatTransformer.java

...ite/uc2/streamprocessing/JointFlatTransformerFactory.java

...a/theodolite/uc2/streamprocessing/JointRecordParents.java

...ava/theodolite/uc2/streamprocessing/RecordAggregator.java

...java/theodolite/uc2/streamprocessing/SensorParentKey.java

...java/theodolite/uc2/streamprocessing/TopologyBuilder.java

...eodolite/uc2/streamprocessing/Uc2KafkaStreamsBuilder.java

...cation/src/main/resources/META-INF/application.properties

...dolite/uc2/streamprocessing/OptionalParentsSerdeTest.java

...ava/theodolite/uc2/streamprocessing/ParentsSerdeTest.java

...dolite/uc2/streamprocessing/SensorParentKeySerdeTest.java

uc2-workload-generator/build.gradle

...ava/theodolite/uc2/workloadgenerator/ConfigPublisher.java

.../java/theodolite/uc2/workloadgenerator/LoadGenerator.java

...theodolite/uc2/workloadgenerator/LoadGeneratorExtrem.java

...eodolite/uc2/workloadgenerator/SensorRegistryBuilder.java

...lite/uc2/workloadgenerator/SensorRegistryBuilderTest.java

...in/java/theodolite/uc3/application/ConfigurationKeys.java

.../main/java/theodolite/uc3/application/HistoryService.java