You will find demos that shows hwo to use Prometheus to monitor your service in your favortie language.
My recommendation is to start with monitoring before investing in the centralized logging (demo of EFK-stack) and introducing tracing.
Demos:
- java - JUGW Meetup Warsaw,
- python - PyCode,
- golang - Golang Warsaw Meetup,
- Zero-downtime deployments on Kubernetes (related).