Support Landing Page on Prometheus Client Output Plugin

[hwanjin-jeong]

Feature Request

Request to add Landing page on Prometheus Client Output Plugin.

The Landing page is one of the recommended developments for the Prometheus exporter.

ref: https://prometheus.io/docs/instrumenting/writing_exporters/#landing-page

We are going to use the landing page for health check about service discovery.

We can use "/metrics" path for health check, but if the metric size is large, unnecessary network costs occur.

Actually, we currently have a system that generates metrics over 20MB, so we want to do health check using the landing page.

Proposal:

Add Landing page on Prometheus Client Output Plugin.

Current behavior:

Use the "/metric" path for health check.

Desired behavior:

Use the "/" path (landing page) for health check.

Use case:

Prometheus is commonly integrated with service discovery to identify target that is being metric collection.such as consul.

A health check is required to maintain list of healthy service, and a landing page is used to reduce unnecessary network costs.