From 76c60c24e162d7dfb7c5b90f72b2c7a6e1208240 Mon Sep 17 00:00:00 2001
From: harshit-splunk <89519921+harshit-splunk@users.noreply.github.com>
Date: Wed, 15 Dec 2021 00:45:44 +0530
Subject: [PATCH] enabled tag interpolation for source value (#203)

---
 lib/fluent/plugin/out_splunk.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/fluent/plugin/out_splunk.rb b/lib/fluent/plugin/out_splunk.rb
index c2bd758..ee3e069 100644
--- a/lib/fluent/plugin/out_splunk.rb
+++ b/lib/fluent/plugin/out_splunk.rb
@@ -193,8 +193,8 @@ def prepare_key_fields
           v = instance_variable_get "@#{f}"
           next unless v
 
-          if v == TAG_PLACEHOLDER
-            instance_variable_set "@#{f}", ->(tag, _) { tag }
+          if v.include? TAG_PLACEHOLDER
+            instance_variable_set "@#{f}", ->(tag, _) { v.gsub(TAG_PLACEHOLDER, tag) }
           else
             instance_variable_set "@#{f}", ->(_, _) { v }
           end