fastly-exporter

This program consumes from the Fastly Real-time Analytics API and makes the data available to Prometheus. It should behave like you expect: dynamically adding new services, removing old services, and reflecting changes to service metadata like name and version.

Getting

Binary

Go to the releases page.

Docker

Available on the packages page as fastly/fastly-exporter.

docker pull ghcr.io/fastly/fastly-exporter:latest

Note that version latest will track RCs, alphas, etc. -- always use an explicit version in production.

Helm chart

Helm must be installed to use the prometheus-community/fastly-exporter chart. Please refer to Helm's documentation to get started.

Once Helm is set up properly, add the repo as follows:

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts

And install:

helm upgrade --install fastly-exporter prometheus-fastly-exporter --namespace monitoring --set token="fastly_api_token"

Source

If you have a working Go installation, you can clone the repo and install the binary from any revision, including HEAD.

git clone git@github.com:fastly/fastly-exporter
cd fastly-exporter
go build ./cmd/fastly-exporter
./fastly-exporter -h

Using

Basic

For simple use cases, all you need is a Fastly API token. See this link for information on creating API tokens. The token can be provided via the -token flag or the FASTLY_API_TOKEN environment variable.

fastly-exporter -token XXX

This will collect real-time stats for all Fastly services visible to your token, and make them available as Prometheus metrics on 127.0.0.1:8080/metrics.

Filtering services

By default, all services available to your token will be exported. You can specify an explicit set of service IDs to export by using the -service xxx flag. (Service IDs are available at the top of your Fastly dashboard.) You can also include only those services whose name matches a regex by using the -service-allowlist '^Production' flag, or exclude any service whose name matches a regex by using the -service-blocklist '.*TEST.*' flag.

For tokens with access to a lot of services, it's possible to "shard" the services among different fastly-exporter instances by using the -service-shard flag. For example, to shard all services between 3 exporters, you would start each exporter as

fastly-exporter [common flags] -service-shard 1/3
fastly-exporter [common flags] -service-shard 2/3
fastly-exporter [common flags] -service-shard 3/3

Filtering metrics

By default, all metrics provided by the Fastly real-time stats API are exported as Prometheus metrics. You can export only those metrics whose name matches a regex by using the -metric-allowlist 'bytes_total$' flag, or exclude any metric whose name matches a regex by using the -metric-blocklist imgopto flag.

Filter semantics

All flags that filter services or metrics are repeatable. Repeating the same flag causes its condition to be combined with OR semantics. For example, -service A -service B would include both services A and B (but not service C). Or, -service-blocklist Test -service-blocklist Staging would skip any service whose name contained Test or Staging.

Different flags (for the same filter target) combine with AND semantics. For example, -metric-allowlist 'bytes_total$' -metric-blocklist imgopto would only export metrics whose names ended in bytes_total, but didn't include imgopto.

Metrics Grouping: by datacenter or aggregate

The Fastly real-time stats API returns measurements grouped by datacenter as well as aggregated measurements for all datacenters. By default, exported metrics are grouped by datacenter. The response body size of the metrics endpoint can potentially be very large. This will be exacerbated when using the exporter with many services, many origins with Origin Inspector, and many domains with Domain Inspector. One way to reduce the output size of the metrics endpoint is by using the -aggregate-only flag. When this flag is used only the aggregated metrics from the real-time stats API will be exported. Metrics will still include the datacenter label but it will always be set to "aggregate".

Service discovery

Per-service metrics are available via /metrics?target=<service ID>. Available services are enumerated as targets on the /sd endpoint, which is compatible with the generic HTTP service discovery feature of Prometheus. An example Prometheus scrape config for the Fastly exporter follows.

scrape_configs:
  - job_name: fastly-exporter
    http_sd_configs:
      - url: http://127.0.0.1:8080/sd
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: service
      - target_label: __address__
        replacement: 127.0.0.1:8080

Dashboards and Alerting

Data from the the Fastly exporter can be used to build dashboards and alerts with Grafana and Alertmanager. For a fully working example see fastly-dashboards created by @mrnetops. Fastly-dashboards contains a Docker Compose setup, which boots up a full fastly-exporter + Prometheus + Alertmanager + Grafana + Fastly dashboard stack with Slack alerting integration.