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README.md
prometheus-exporter-merger
Merges Prometheus metrics from multiple sources.
But Why?!
Sometimes you need to scrape Prometheus metrics from multiple containers in a single pod, but you can't do this using annotations: prometheus/prometheus#3756.
To start the exporter:
prometheus-exporter-merger --config /config/prometheus-exporter-merger.yaml
Config example:
listen: :8080
scrap_timeout: 20s
sources:
- url: http://127.0.0.1:8081/metrics
labels:
keyX: valueX
keyY: Y
- url: http://127.0.0.1:8082/metrics
labels:
key2: Z
Another way to pass configuration by setting environment variables:
export LISTEN=":8080"
export SCRAPE_TIMEOUT="20s"
export URL_1=http://127.0.0.1:801/api/v1/metrics/prometheus,keyX:valueX,keyY:Y
export URL_2=http://0.0.0.0:7070/api/v1/metrics/prometheus,key2:Z
Kubernetes
The prometheus-exporter-merger is supposed to run as a sidecar.
...
template:
metadata:
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "8080"
...
spec:
containers:
...
- name: prometheus-exporter-merger
image: vadv/prometheus-exporter-merger
env:
- name: LISTEN
value: :8080
- name: SCRAPE_TIMEOUT
value: 20s
- name: URL_COMMON
value: http://127.0.0.1:8081/api/v1/metrics/prometheus,type:common
- name: URL_AUDIT
value: http://127.0.0.1:8082/api/v1/metrics/prometheus,type:audit
...