[clang-tools-extra] [clangd] Add metric for rename decl kind (PR #83867)

[David Goldman via cfe-commits]

https://github.com/DavidGoldman created https://github.com/llvm/llvm-project/pull/83867

This will give us insight into what users are renaming in practice - for instance, try to gauge the impact of the ObjC rename support.

>From 42dddf4a5fbd862bf2f122a6c6216fe0dbd34e54 Mon Sep 17 00:00:00 2001
From: David Goldman <davg at google.com>
Date: Mon, 4 Mar 2024 11:35:46 -0500
Subject: [PATCH] [clangd] Add metric for rename decl kind

This will give us insight into what users are
renaming in practice.
---
 clang-tools-extra/clangd/refactor/Rename.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clang-tools-extra/clangd/refactor/Rename.cpp b/clang-tools-extra/clangd/refactor/Rename.cpp
index 4e135801f6853d..0cc7eecd6212be 100644
--- a/clang-tools-extra/clangd/refactor/Rename.cpp
+++ b/clang-tools-extra/clangd/refactor/Rename.cpp
@@ -1072,6 +1072,10 @@ llvm::Expected<RenameResult> rename(const RenameInputs &RInputs) {
   if (Reject)
     return makeError(*Reject);
 
+  static constexpr trace::Metric RenameTriggerCounter(
+      "rename_trigger_count", trace::Metric::Counter, "decl_kind");
+  RenameTriggerCounter.record(1, RenameDecl.getDeclKindName());
+
   // We have two implementations of the rename:
   //   - AST-based rename: used for renaming local symbols, e.g. variables
   //     defined in a function body;