Merge branch 'master' into release-1.6

.docs/changelog.md

.gitlab-ci.yml

dbrepo-auth-service/init/.coveragerc

dbrepo-auth-service/init/.gitignore

dbrepo-auth-service/init/Pipfile

dbrepo-auth-service/init/Pipfile.lock

dbrepo-auth-service/init/app.py

dbrepo-auth-service/init/test/conftest.py

dbrepo-auth-service/init/test/test_integration_app.py

dbrepo-auth-service/init/test/test_unit_app.py

...o-auth-service/listeners/target/create-event-listener.jar

dbrepo-metadata-service/metrics.md

...tories/src/main/java/at/tuwien/mapper/MetadataMapper.java

...rvice/src/main/java/at/tuwien/endpoints/UserEndpoint.java

...src/main/java/at/tuwien/handlers/ApiExceptionHandler.java

...c/test/java/at/tuwien/endpoints/UserEndpointUnitTest.java

...st/java/at/tuwien/gateway/DataServiceGatewayUnitTest.java

...ava/at/tuwien/gateway/KeycloakGatewayIntegrationTest.java

...test/java/at/tuwien/handlers/ApiExceptionHandlerTest.java

...rc/test/java/at/tuwien/mvc/PrometheusEndpointMvcTest.java