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After you add the App Check SDK to your app, but before you enable App Check enforcement, you should make sure that doing so won't disrupt your existing legitimate users.
For Cloud Functions, you can get App Check metrics by examining your functions' logs. Every invocation of a callable function emits a structured log entry like the following example:
{
"severity": "INFO", // INFO, WARNING, or ERROR
"logging.googleapis.com/labels": {"firebase-log-type": "callable-request-verification"},
"jsonPayload": {
"message": "Callable header verifications passed.",
"verifications": {
// ...
"app": "MISSING", // VALID, INVALID, or MISSING
}
}
}
You can analyze these metrics in the Google Cloud console by creating a logs-based counter metric with the following metric filter:
resource.type="cloud_function" resource.labels.function_name="YOUR_CLOUD_FUNCTION" resource.labels.region="us-central1" labels.firebase-log-type="callable-request-verification"
Label the metric using the field jsonPayload.verifications.appCheck.
When you understand how App Check will affect your users and you're ready to proceed, you can enable App Check enforcement for Cloud Functions.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-15 UTC.
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