added release notes

RELEASE_NOTES.md

@@ -2,7 +2,30 @@
 
 # 0.73.0
 
+The `0.73.0` release contains various changes and improvements, but most 
+importantly it introduces the support to deploy and enroll un-managed ZenML Pro 
+tenants in the ZenML Pro control plane (Helm deployment options, secure 
+enrollment, CSRF tokens) and other features necessary for self-hosted, 
+multi-domain ZenML Pro installations.
+
+## Other Features
+
+- Vertex AI experiment tracker integration
+- Experiment comparison tooling
+- Support for new Airflow KubernetesPodOperator import paths
+- Updated Slack alerter implementation
+- Independent memory resource configuration for migration pods in Helm charts
+
+## Improvements
+
+- Added environment variable to allow non-ASCII characters in JSON dumps
+- Removed gluon from MLflow log suppression list
+- Enhanced resource reporting with automatic conversion
+- Documentation updates for Kubeflow Pipelines and LLMs
+- Various bugfixes for the ZenML dashboard
+
 ## What's Changed
+
 * On-prem Pro tenants: secure enrollment, CSRF tokens and cross-domain authorization flow by @stefannica in https://github.com/zenml-io/zenml/pull/3264
 * Fix the misc release actions by @schustmi in https://github.com/zenml-io/zenml/pull/3286
 * Add 0.72.0 to the migration tests by @schustmi in https://github.com/zenml-io/zenml/pull/3285
@@ -20,6 +43,7 @@
 * [helm] Independent setting of memory resources for migration pods by @wjayesh in https://github.com/zenml-io/zenml/pull/3281
 
 ## New Contributors
+
 * @matemijolovic made their first contribution in https://github.com/zenml-io/zenml/pull/3289
 * @Frank995 made their first contribution in https://github.com/zenml-io/zenml/pull/3257
 * @nkhusainov made their first contribution in https://github.com/zenml-io/zenml/pull/3260