cleanup of outdated examples (#279)

* cleanup of outdated examples

* Dockerfile not used anywhere

* fix docu

* docu fix

CODEOWNERS

@@ -17,19 +17,17 @@
 /incluster_eventing/ @m00g3n @pPrecel @dbadura @kwiatekus @cortey
 
 # Custom function runtime image example
-/custom-serverless-runtime-image/ @m00g3n @pPrecel @dbadura @kwiatekus @cortey
+/custom-serverless-runtime-image/ @kyma-project/otters
 
 # Observability
 /jaeger/ @kyma-project/observability
 /kiali/ @kyma-project/observability
 /loki/ @kyma-project/observability
-/metrics-otlp/ @kyma-project/observability
 /prometheus/ @kyma-project/observability
 /trace-demo/ @kyma-project/observability
-/tracing/ @kyma-project/observability
 
 # Scaling functions to zero with KEDA
-/scale-to-zero-with-keda @m00g3n @pPrecel @dbadura @kwiatekus @cortey @anoipm @MichalKalke
+/scale-to-zero-with-keda @kyma-project/otters
 
 # All .md files
-*.md @mmitoraj @NHingerl @grego952 @IwonaLanger @nataliasitko
+*.md @kyma-project/technical-writers

CONTRIBUTING.md

@@ -84,10 +84,6 @@ All examples are deployable in the cloud. Follow these rules to achieve this and
 
 A CI/CD configuration file accompanies each example to ensure its validity as part of the automation pipeline.
 
-### Acceptance tests
-
-For details on acceptance tests for examples, see the [`acceptance-tests`](tests/README.md) document.
-
 ### Releases
 
 Each example is independently releasable by creating a `tag` in the repository with the `{example-name}/{version}` format. This triggers a release for the given example from its CI/CD configuration. Push released example Docker images to the `example` folder in the Kyma repository, under `eu.gcr.io/kyma-project/example`.

README.md

@@ -30,7 +30,6 @@ The summary of the documentation in the `examples` repository lists all availabl
 | [Gateway](gateway/README.md) | Expose APIs for functions or services.  | Kubeless |
 | [Service Binding](service-binding/lambda/README.md) | Bind a Redis service to a lambda function. | Kubeless, Redis, NodeJS |
 | [Event Email Service](event-email-service/README.md) | Send an automated email upon receiving an Event.  | NodeJS |
-| [Tracing](tracing/README.md) | Configure tracing for a service in Kyma. | Go |
 | [Custom serverless runtime image](custom-serverless-runtime-image/README.md) | Build custom runtime image. | Python |
 | [Kiali](kiali/README.md) | Deploy Kiali to Kyma. | Kiali, Istio, Prometheus |
 | [Prometheus](prometheus/README.md) | Deploy a Prometheus stack to monitor custom metrics. | Prometheus, Grafana |