From 386eaf0f3364caab3192c92e46882fca8c71ee97 Mon Sep 17 00:00:00 2001
From: Jens Erat <jens.erat@telekom.de>
Date: Wed, 30 Oct 2024 13:39:30 +0100
Subject: [PATCH] expose fluentd metrics also on IPv6

Currently, IPv6 only clusters cannot scrape metrics from fluentd, as fluentd's `bind` default is `0.0.0.0`. Any IPv6 only cluster will fail scrapes.

fluentd currently does not support binding both IPv6 and IPv4 in a single source. Adding a second IPv6 source makes fluentd listen on both IPv4 and IPv6, allowing scrapes universally.

Fixes #1835

Signed-off-by: Jens Erat <jens.erat@telekom.de>
---
 pkg/resources/fluentd/config.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkg/resources/fluentd/config.go b/pkg/resources/fluentd/config.go
index 132f0fe26..f8eef3bf6 100644
--- a/pkg/resources/fluentd/config.go
+++ b/pkg/resources/fluentd/config.go
@@ -63,6 +63,15 @@ var fluentdInputTemplate = `
     metrics_path {{ .Monitor.Path }}
 {{- end }}
 </source>
+<source>
+    @type prometheus
+    @id in_prometheus6
+    bind "::"
+    port {{ .Monitor.Port }}
+{{- if .Monitor.Path }}
+    metrics_path {{ .Monitor.Path }}
+{{- end }}
+</source>
 <source>
     @type prometheus_monitor
 </source>