From a5071eed4b712fd1b195347edf746d82114a37a7 Mon Sep 17 00:00:00 2001
From: David Boike <david.boike@gmail.com>
Date: Tue, 8 Apr 2025 16:38:57 -0500
Subject: [PATCH] Use generated regex for better error ingestion performance

---
 .../Grouping/Groupers/StackTraceParser.g.cs              | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/ServiceControl/Recoverability/Grouping/Groupers/StackTraceParser.g.cs b/src/ServiceControl/Recoverability/Grouping/Groupers/StackTraceParser.g.cs
index 8cde4799db..8f81a1a6d2 100644
--- a/src/ServiceControl/Recoverability/Grouping/Groupers/StackTraceParser.g.cs
+++ b/src/ServiceControl/Recoverability/Grouping/Groupers/StackTraceParser.g.cs
@@ -34,7 +34,7 @@ partial class StackTraceParser
         const string Space = @"[\x20\t]";
         const string NotSpace = @"[^\x20\t]";
 
-        static readonly Regex Regex = new Regex(@"
+        [GeneratedRegex(@"
             ^
             " + Space + @"*
             \w+ " + Space + @"+
@@ -71,7 +71,10 @@ partial class StackTraceParser
             // fall into the "catastrophic backtracking" trap due to over
             // generalization.
             // https://github.com/atifaziz/StackTraceParser/issues/4
-            TimeSpan.FromSeconds(5));
+            5000)]
+        private static partial Regex StackTraceRegex();
+
+        static readonly Regex StackTraceRegexInstance = StackTraceRegex();
 
         public static IEnumerable<T> Parse<T>(
             string text,
@@ -104,7 +107,7 @@ public static IEnumerable<TFrame> Parse<TToken, TMethod, TParameters, TParameter
             if (sourceLocationSelector == null) throw new ArgumentNullException("sourceLocationSelector");
             if (selector == null) throw new ArgumentNullException("selector");
 
-            return from Match m in Regex.Matches(text)
+            return from Match m in StackTraceRegexInstance.Matches(text)
                    select m.Groups into groups
                    let pt = groups["pt"].Captures
                    let pn = groups["pn"].Captures