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Health Exporter

A prometheus exporter for continous health check of different endpoints.

In comparision to blackbox-exporter which probes endpoints on each prometheus scrape, this exporter continuously probes the endpoints with configured RPS, so prometheus can scrape on a longer interval, and calculate success rate, latency avg or percentiles, with a much higher resolution. Also this can be used to health-check an endpoint with a high RPS synthetic load.

Build

Docker

docker build -t health-exporter .

Binary

git clone --depth 1 https://github.com/snapp-cab/health-exporter.git
cd health-exporter
go build

Installation

Docker

sudo docker run -p 8080:8080 -v ./config.yaml:/app/config.yaml:z docker.pkg.github.com/snapp/health-exporter/image:latest

Helm chart

  • Prerequisites
    • Helm 3.0+ (Helm 2 is not supported)
    • Kubernetes 1.10+ - This is the earliest version of Kubernetes tested. It is possible that this chart works with earlier versions but it is untested.
  1. Add the SnappCab Helm Repository:
helm repo add snapp-cab https://snapp-cab.github.io/health-exporter/charts
helm repo update
  1. Install with:
helm install health-exporter snapp-cab/health-exporter

Binary releases

export VERSION=1.0.0
wget https://github.com/cafebazaar/health-exporter/releases/download/v${VERSION}/health-exporter-${VERSION}.linux-amd64.tar.gz
tar xvzf health-exporter-${VERSION}.linux-amd64.tar.gz health-exporter-${VERSION}.linux-amd64/health-exporter

Usage

Run health-exporter

health-exporter -config <PathToConfig>

See example configuration file for sample config file.

Currently, health-exporter supports these probes:

Name Description
http For http(s) calls to different endpoints
dns For dns requests to different DNS servers
k8s For k8s-api health check

Metrics

Metric Notes
health_http_requests_total Total number of http requests
health_http_duration_seconds_count Total number of http requests
health_http_duration_seconds_sum Duration of http requests with response code
health_http_duration_seconds_bucket Count of http requests per bucket (for calculating percentile)
health_dns_requests_total Total number of dns requests
health_dns_duration_seconds_count Total number of dns requests
health_dns_duration_seconds_sum Duration of dns requests with response code
health_dns_duration_seconds_bucket Count of dns requests per bucket (for calculating percentile)
health_k8s_http_request_total Total number of k8s api requests
health_k8s_http_request_duration_seconds_count Total number of k8s api requests
health_k8s_http_request_duration_seconds_sum Duration of k8s api requests with response code
health_k8s_pod_count Number of pods (used as a health-check for api-server)

Security

Reporting security vulnerabilities

If you find a security vulnerability or any security related issues, please DO NOT file a public issue, instead send your report privately to [email protected]. Security reports are greatly appreciated and we will publicly thank you for it.

License

Apache-2.0 License, see LICENSE.