Sorted:

Spring Cloud Sleuth in a Monolith Application

Kafka broker connection on local / AWS

Tracking request duration with Prometheus

Grafana Alerts on Spring Boot App

OpenTelemetry with Java Guide

The Anatomy of a PromQL Query

Prometheus Counter Metrics

Kafka Docker Compose – Fast Bootup Script

Spring Boot app metrics – with Prometheus and Micrometer

Monitoring Spring Boot with Prometheus and Grafana