implement app monitoring framework

Allow developers and product owners to see app activity and usage

Done:

[K8 observability](https://github.com/javajon/kubernetes-observability) implemented on product
- [ ] Start a personal Kubernetes cluster - dev-completed don't need
- [ ] Add a private Docker registry along with a dashboard - portability
- [x] Add a monitoring tool stack with Prometheus, Alertmanager and Grafana
- [ ] Start the 3 microservices on Kubernetes
- [x] Monitor the microservices metrics through Prometheus and Grafana