Test App Engine Flexible reliability with Gremlin Failure Flags. Inject latency and errors to validate timeouts and retry logic.
App Engine Flexible occupies an awkward middle ground. You get container-level control, which suggests you manage the runtime, but the instance lifecycle still belongs to the platform. Teams reason about it as though it were a VM, and that model breaks in specific places.
Long-lived connections are the clearest example. Instances get recycled on the platform's schedule, so code that holds connections or accumulates in-memory state across requests behaves differently than it would somewhere you controlled the lifecycle. Combine that with a dependency that starts failing and the interaction produces behavior nobody designed.
Add the Failure Flags SDK to your application and you can inject latency and errors into specific code paths on a live deployment. You'll see how your application handles being both managed and stateful, which is where the surprises live.
Testing that assumes a pure VM or a pure serverless model misses this combination entirely, and it's the combination you actually deployed.
Dependencies: Failure Test
Simulate a failed dependency by dropping all network traffic to the dependency.
Dependencies: Latency Test
Recreate poor network conditions by delaying all network traffic to a dependency by 100ms.
Unreliable Networks - Dependencies
Simulate unreliable network conditions when communicating with dependencies by adding latency to API calls. Test whether your users are affected when dependency response times degrade.
* Failure Flags works wherever you can add the SDK to your application and run the Gremlin sidecar. Not every language and platform combination has been individually tested, and not all are officially supported. Check our compatibility documentation for what's verified, or get in touch if you don't see your runtime.
Intelligent Health Checks - GCP
Automatically monitor your Google Cloud services during testing in one-click with Intelligent Health Checks.
Avoid downtime. Use Gremlin to turn failure into resilience.
Gremlin empowers you to proactively root out failure before it causes downtime. See how you can harness chaos to build resilient systems by requesting a demo of Gremlin.
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