Configure Prometheus for AWS EC2 discovery

README.md

I had trouble figuring out how to configure Prometheus EC2 instances discovery once, so I'm sharing this gist that includes some sample config that worked fine for me with Prometheus v2.17.2!

• You should of course start by reading the official documentation
• But at the time of writing, it was incomplete or misleading; the author seems to know but does not seem to care though.
• Also, make sure to use a recent version of Prometheus.
• If nothing works, well, you can have a look at the source code.

Good luck!

prometheus.yml

global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.

scrape_configs:
  - job_name: 'node'
    scrape_interval: 15s
    scrape_timeout: 10s
    metrics_path: '/metrics'
    scheme: http
    ec2_sd_configs:
      - region: eu-west-1
        profile: '${INSTANCE_PROFILE_ARN}'
        port: 9009
    relabel_configs:
      - source_labels: [__meta_ec2_tag_Namespace]
        regex: '${NAMESPACE}'
        action: keep
      - source_labels: [__meta_ec2_tag_Environment]
        regex: '${ENVIRONMENT}'
        action: keep
      #Use the instance ID as the instance label
      - source_labels: [__meta_ec2_tag_Name]
        target_label: instance