Add new Metrics API (#26919)

server/scripts/vet-api-check.sh

@@ -43,6 +43,7 @@ OUTPUT_EXCLUDING_IGNORED=$(echo "$OUTPUT" | grep -Fv \
     -e 'Cannot find /api/v4/hosted_customer/subscribe-newsletter method: POST in OpenAPI 3 spec.' \
     -e 'Cannot find /api/v4/license/review method: POST in OpenAPI 3 spec.' \
     -e 'Cannot find /api/v4/license/review/status method: GET in OpenAPI 3 spec.' \
+    -e 'Cannot find /api/v4/perf method: POST in OpenAPI 3 spec.' \
     -e 'Cannot find /api/v4/posts/{post_id}/edit_history method: GET in OpenAPI 3 spec.' \
     -e 'Cannot find /api/v4/posts/{post_id}/info method: GET in OpenAPI 3 spec.' \
     -e 'Cannot find /api/v4/posts/search method: POST in OpenAPI 3 spec.' \