add api docs

Author: gregns1

docs/api/admin.yaml

@@ -97,6 +97,8 @@ paths:
     $ref: ./paths/admin/_debug-pprof-trace.yaml
   /_debug/fgprof:
     $ref: ./paths/admin/_debug-fgprof.yaml
+  /_debug/stacktrace:
+    $ref: ./paths/admin/_debug-stack_trace.yaml
   /_post_upgrade:
     $ref: ./paths/admin/_post_upgrade.yaml
   '/{db}/_config':

docs/api/paths/admin/_debug-stack_trace.yaml

@@ -0,0 +1,24 @@
+# Copyright 2025-Present Couchbase, Inc.
+#
+# Use of this software is governed by the Business Source License included
+# in the file licenses/BSL-Couchbase.txt.  As of the Change Date specified
+# in that file, in accordance with the Business Source License, use of this
+# software will be governed by the Apache License, Version 2.0, included in
+# the file licenses/APL2.txt.
+get:
+  summary: Get stack trace for all goroutines
+  description: |-
+    Returns stack traces of all running goroutines in Sync Gateway.
+
+    Required Sync Gateway RBAC roles:
+
+    * Sync Gateway Dev Ops
+  responses:
+    '200':
+      description: OK
+      content:
+        application/json:
+          schema:
+            type: string
+  tags:
+    - Profiling