Prometheus metrics

Kubernetes Ingress Controller, as well as Kong Gateway, both expose Prometheus metrics, under certain conditions:

• Kubernetes Ingress Controller, since version 2.0, exposes Prometheus metrics for configuration updates.
• Kong Gateway can expose Prometheus metrics for served requests, if the Prometheus plugin is enabled. See the Using KongPlugin resource guide for information on how to enable a plugin. Also, we provide a specific guide for integration with Prometheus and Grafana as well.

This document is a reference for the former type.

Metric name	Description
send_configuration_count[success=true|false][type=post-config|deck]	Counts the success/failure events of converting kubernetes resources to a KongState, including conversion.
ingress_parse_count[success=true|false]	Counts (successful and unsuccessful) events of interpreting ingress configurations in Kubernetes. success=false means a configuration error and is a good candidate for an alert.
proxy_configuration_duration_milliseconds	Duration of the last successful configuration.

In addition to the above, Kubernetes Ingress Controller exposes more low-level performance metrics - these may however change from version to version, as they are provided by underlying frameworks of Kubernetes Ingress Controller.

A non-exhaustive list of these low-level metrics is present in the following places:

• controller-runtime metrics definition
• workqueue metrics definition