Implement Prometheus Metrics

[jbethune777]

https://stackabuse.com/nodejs-application-monitoring-with-prometheus-and-grafana/ - - useful starting point.

Will sync with @carlydopps on this.

[jbethune777]

More useful links:
https://blog.andreev.it/2023/01/kubernetes-monitoring-node-js-application-with-prometheus-and-grafana-helm-charts/
https://klaushofrichter.medium.com/mostly-static-metrics-with-nodejs-kubernetes-and-grafana-29f7b4e76181
https://github.com/siimon/prom-client