Integrate micrometer-metrics into the stack

The NEV stack now supports metrics reporting to Datadog. Previewer To enable the integration you can use these environment variables: ARENDERSRV_ARENDER_SERVER_EXPORT_DATADOG_ENABLED= true ARENDERSRV_ARENDER_SERVER_EXPORT_DATADOG_API-KEY=... You can also use the environment variables below: ARENDERSRV_ARENDER_SERVER_METRICS_TAGS_HOST=arender-previewer ARENDERSRV_ARENDER_SERVER_METRICS_TAGS_APP-NAME=previewer ARENDERSRV_ARENDER_SERVER_METRICS_TAGS_SERVICE=nev-ui Rendition To enable the integration you can use these environment variables prefixed by the corresponding service (DCV for converter, DRN for renderer, DSB for broker, DTH for text-handler): MANAGEMENT_METRICS_EXPORT_DATADOG_ENABLED= true MANAGEMENT_METRICS_EXPORT_DATADOG_API_KEY=.... You can also use the environment variables below: MANAGEMENT_METRICS_EXPORT_DATADOG_BATCH-SIZE=5000 MANAGEMENT_METRICS_EXPORT_DATADOG_STEP=10s MANAGEMENT_METRICS_TAGS_HOST=arender-document-service-broker MANAGEMENT_METRICS_TAGS_APPLICATION=broker MANAGEMENT_METRICS_TAGS_SERVICE=nev-rendition