Chapter 8, Troubleshooting and Validation

1. Prometheus is distributed with promtool which, among other functions, can check a configuration file for issues:

promtool check config /etc/prometheus/prometheus.yml

2. The promtool utility can also read metrics in the Prometheus exposition format from stdin and validate them according to the current Prometheus standards:

curl -s http://prometheus:9090/metrics | promtool check metrics

3. The promtool utility can be used to run instant queries against a Prometheus instance:

promtool query instant 'http://prometheus:9090' 'up == 1'

4. You can use promtool to find every label value for a given label name. One example is the following:

promtool query labels 'http://prometheus:9090' 'mountpoint'

5. By adding --log.level=debug to the start-up parameters.
6. The /-/healthy endpoint will tell you (or the orchestration...