---
title: Added anomaly signal
summary: null
url: >-
  https://www.fastly.com/documentation/reference/changes/2022/04/added-anomaly-signal
---

- Added Anomaly Signal: GRAPHQL-DUPLICATE-VARIABLES, which detects duplicated string substitution variable names in GraphQL requests.
- Added Anomaly Signal: GRAPHQL-UNDEFINED-VARIABLES, which detects undefined string substitution variables in GraphQL requests.
- Added Anomaly Signal: GRAPHQL-MISSING-REQUIRED-OPERATION-NAME, which detects the absence of the active operation required for multi-operation GraphQL requests.