Merge branch 'M3-observability' into 'main'

README.md

application/docker-compose.yml

...cation/grafana/provisioning/datasources/prometheus_ds.yml

...ule-certificate/src/main/resources/application.properties

...module-exercise/src/main/resources/application.properties

...language-school/src/main/resources/application.properties

...ion/module-mail/src/main/resources/application.properties

application/podman-compose.yml

application/pom.xml

application/prometheus/prometheus.yml

docs/grafana01.png

docs/grafana02.png

docs/grafana03.png

docs/grafana04.png