[WIP] Partial bot skeleton, non-functional though

vendor/github.com/cockroachdb/pebble/internal/cache/clockpro_tracing.go

@@ -0,0 +1,20 @@
+// Copyright 2022 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+//go:build tracing
+// +build tracing
+
+package cache
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+func (c *Cache) trace(msg string, refs int64) {
+	s := fmt.Sprintf("%s: refs=%d\n%s", msg, refs, debug.Stack())
+	c.tr.Lock()
+	c.tr.msgs = append(c.tr.msgs, s)
+	c.tr.Unlock()
+}