refactor(config): apply all pm2_env vars unconditionally, not just DD_*/OTEL_*

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tlhunter

init.js

@@ -1,7 +1,7 @@
 'use strict'
 
 // In PM2 cluster mode, per-app env vars arrive as a pm2_env JSON blob after
-// --require has already run. Apply DD_*/OTEL_* keys before guardrails so that
+// --require has already run. Apply all keys before guardrails so that
 // DD_INJECT_FORCE, DD_INJECTION_ENABLED, etc. reflect the per-app config.
 // Object.keys is safe here: PM2 only runs on Node.js 0.10+, so pm2_env is never
 // set on older runtimes and the guardrails still report incompatibility gracefully.
@@ -13,7 +13,7 @@ if (typeof pm2EnvStr === 'string') {
     for (var i = 0; i < pm2Keys.length; i++) {
       var k = pm2Keys[i]
       var v = pm2Config[k]
-      if ((k.indexOf('DD_') === 0 || k.indexOf('OTEL_') === 0) && v != null) {
+      if (v != null) {
         process.env[k] = String(v)
       }
     }