[clangd] Add metric for rename decl kind

[DavidGoldman]

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

[llvmbot]

@llvm/pr-subscribers-clang-tools-extra

@llvm/pr-subscribers-clangd

Author: David Goldman (DavidGoldman)

Changes

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

---

Full diff: https://github.com/llvm/llvm-project/pull/83867.diff

1 Files Affected:

• (modified) clang-tools-extra/clangd/refactor/Rename.cpp (+4)

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;