From 8a86705e51b78ed0f70d71e28c5cd860be91c2b8 Mon Sep 17 00:00:00 2001
From: Aman Gupta Karmani <aman@tmm1.net>
Date: Fri, 19 Jun 2020 07:17:24 -0700
Subject: [PATCH] FIX: handle heroku style HTTP_X_REQUEST_START (#10087)

---
 lib/middleware/request_tracker.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/middleware/request_tracker.rb b/lib/middleware/request_tracker.rb
index 4fbe3d1b2a3..a346b44112d 100644
--- a/lib/middleware/request_tracker.rb
+++ b/lib/middleware/request_tracker.rb
@@ -145,7 +145,11 @@ class Middleware::RequestTracker
   def self.populate_request_queue_seconds!(env)
     if !env['REQUEST_QUEUE_SECONDS']
       if queue_start = env['HTTP_X_REQUEST_START']
-        queue_start = queue_start.split("t=")[1].to_f
+        queue_start = if queue_start.start_with?("t=")
+          queue_start.split("t=")[1].to_f
+        else
+          queue_start.to_f / 1000.0
+        end
         queue_time = (Time.now.to_f - queue_start)
         env['REQUEST_QUEUE_SECONDS'] = queue_time
       end