Prometheus Exporter for Google Pagespeed Online Metrics

Examples

To start the example with the default dashboard (docker-compose required)

$ git clone git@github.com:foomo/pagespeed_exporter.git
$ cd pagespeed_exporter/example
$ docker-compose up -d

After that, the application should be running on localhost:3000 with username admin and password s3cr3t.

The provided dashboard (Pagespeed) will be loaded with data after the first scrape.

The dashboard can be found at grafana

Note: The example dashboard assumes you're fetching all pagespeed categories.

Understanding Metrics

• https://github.com/GoogleChrome/lighthouse/blob/master/docs/understanding-results.md
• https://developers.google.com/speed/docs/insights/v5/reference/pagespeedapi/runpagespeed

Prometheus exporter for google pagespeed metrics

Building And Running

Building

$ make

Examples

To run pagespeed exporter we need to obtain the google api key for the pagespeed. Instructions how to create a key for pagespeed can be found here

pagespeed_exporter <arguments>

$ pagespeed_exporter -api-key {KEY} -targets https://google.com,https://prometheus.io -listener :80

Exporter Target Specification

Targets can be configured in either plaintext

https://github.com/foomo/pagespeed_exporter
https://mysite.com/test?test=true

Or via JSON which adds additional parameters

// URL can't be invalid
// Strategy can only be mobile/desktop
// If strategy is not specified, both desktop & mobile will be used
// Categories can be any of accessibility/best-practices/performance/pwa/seo
// If categories are not specified, all categories will be used
// Parameters are passed down to google pagespeed api

{"url":"https://github.com/foomo/pagespeed_exporter","campaign":"test","locale":"en","source":"source"}

{"url":"https://mysite.com/test?test=true","strategy":"mobile"}

{"url":"https://mysite.com/test?test=true","categories": ["best-practices"]}

Configuration specification in JSON and plain is supported both in command line & prometheus configuration

Exporter configuration

Configuration of targets can be done via docker and via prometheus

Flag	Variable	Description	Default	Required
-api-key	PAGESPEED_API_KEY	sets the google API key used for pagespeed		False
-targets	PAGESPEED_TARGETS	comma separated list of targets to measure		False
-categories	PAGESPEED_CATEGORIES	comma separated list of categories to check	accessibility,best-practices,performance,pwa,seo	False
-t	NONE	multi-value target array (check docker comp)		False
-listener	PAGESPEED_LISTENER	sets the listener address for the exporters	:9271	False
-parallel	PAGESPEED_PARALLEL	sets the execution of targets to be parallel	false	False
-pushGatewayUrl	PUSHGATEWAY_URL	sets the pushgateway url to send the metrics		False
-pushGatewayJob	PUSHGATEWAY_JOB	sets the pushgateway job name	pagespeed_exporter	False

Note: google api key is required only if scraping more than 2 targets/second

Note: exporter can be run without targets, and later targets provided via prometheus

Pushing metrics via push gateway

If you don't want to change the prometheus scrape_configs, you can send the metrics using push gateway using a batch job. Just configure the pushgateway url and use the /probe endpoint with query parameter target and the metrics will be send to prometheus.

curl http://localhost:9271/probe?target=https://www.example.com

Exporter Target Configuration (VIA PROMETHEUS)

Example configuration with simple and complex values

(Examples can ve found in the example folder)

  - job_name: pagespeed_exporter_probe
      metrics_path: /probe
      # Re-Label configurations so that we can use them
      # to configure the pagespeed exporter
      relabel_configs:
        - source_labels: [__address__]
          target_label: __param_target
        - source_labels: [__param_target]
          target_label: instance
        - target_label: __address__
          replacement: "pagespeed_exporter:9271"
      static_configs:
        - targets:
            - 'https://example.com/' # Example PLAIN
            - '{"url":"https://example.com/","campaign":"test","locale":"en","source":"source"}'  
            - '{"url":"https://example.com/mobileonly","strategy":"mobile"}'                    

Docker

$ docker run -p "9271:9271" --rm foomo/pagespeed_exporter -api-key {KEY} -t https://google.com,https://prometheus.io

or

$ docker run -p "9271:9271" --rm \
    --env PAGESPEED_API_KEY={KEY} \
    --env PAGESPEED_TARGETS=https://google.com,https://prometheus.io \
    --env PAGESPEED_CATEGORIES=accessibility,pwa \
    foomo/pagespeed_exporter

Prometheus & Docker Compose

Check out the docker-compose folder

Kubernetes/Helm

You can install the included Helm chart to your k8s cluster with:

$ helm install helm/pagespeed-exporter

And then, to quickly test it:

$ kubectl get pods
pagespeed-exporter-riotous-dragonfly-6b99955999-hj2kw   1/1     Running   0          1m

$ kubectl exec -ti pagespeed-exporter-riotous-dragonfly-6b99955999-hj2kw -- sh
# apk add curl
# curl localhost:9271/metrics
pagespeed_lighthouse_audit_score{audit="first-contentful-paint",host="https://www.google.com",path="/",strategy="mobile"} 1
pagespeed_lighthouse_audit_score{audit="first-contentful-paint",host="https://www.google.com",path="/webhp",strategy="desktop"} 1
pagespeed_lighthouse_audit_score{audit="first-contentful-paint",host="https://www.google.com",path="/webhp",strategy="mobile"} 1
...