From 283a891e9290fc9fdbfd082f3bde48863f1c6f45 Mon Sep 17 00:00:00 2001
From: Renaud Chaput <renchap@gmail.com>
Date: Thu, 16 May 2024 11:28:10 +0200
Subject: [PATCH] Allow to customise the OTEL service name prefix (#30322)

---
 config/initializers/opentelemetry.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/config/initializers/opentelemetry.rb b/config/initializers/opentelemetry.rb
index e50132d461..9af0ab89c8 100644
--- a/config/initializers/opentelemetry.rb
+++ b/config/initializers/opentelemetry.rb
@@ -53,10 +53,12 @@ if ENV.keys.any? { |name| name.match?(/OTEL_.*_ENDPOINT/) }
       },
     })
 
+    prefix = ENV.fetch('OTEL_SERVICE_NAME_PREFIX', 'mastodon')
+
     c.service_name =  case $PROGRAM_NAME
-                      when /puma/ then 'mastodon/web'
+                      when /puma/ then "#{prefix}/web"
                       else
-                        "mastodon/#{$PROGRAM_NAME.split('/').last}"
+                        "#{prefix}/#{$PROGRAM_NAME.split('/').last}"
                       end
     c.service_version = Mastodon::Version.to_s
   end