# Failure Flags

Published articles for Failure Flags.

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## Announcing no-code application fault injection

DevFeed: [Announcing no-code application fault injection](<https://devfeed.tech/articles/announcing-no-code-application-fault-injection-11559.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/announcing-failure-flags-no-code-application-fault-injection>)

Author: Andre Newman

Published: 2026-06-02T00:00:00Z

Content type: release

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [Chaos Engineering](<https://devfeed.tech/topics/chaos-engineering.md>), [Testing](<https://devfeed.tech/topics/testing.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [Latency](<https://devfeed.tech/topics/latency.md>), [observability](<https://devfeed.tech/topics/observability.md>)

Tags: [availability](<https://devfeed.tech/tags/availability.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [health-checks](<https://devfeed.tech/tags/health-checks.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [latency](<https://devfeed.tech/tags/latency.md>), [no-code](<https://devfeed.tech/tags/no-code.md>), [observability](<https://devfeed.tech/tags/observability.md>), [performance](<https://devfeed.tech/tags/performance.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [testing](<https://devfeed.tech/tags/testing.md>), [uptime](<https://devfeed.tech/tags/uptime.md>)

### AI overview

Gremlin announces Failure Flags by proxy, a no-code application fault injection solution for serverless and managed applications. The sidecar proxy enables reliability tests such as simulating outages, adding latency, and generating exceptions without code changes. Intelligent Health Checks automatically monitor network throughput, latency, and error rate during tests.

### Source excerpt

Gremlin announces Failure Flags by proxy, a no-code application fault injection solution for serverless and managed applications. Learn more in our latest blog post.

## How to test application resiliency by simulating the Cloudflare December 2025 outage

DevFeed: [How to test application resiliency by simulating the Cloudflare December 2025 outage](<https://devfeed.tech/articles/how-to-test-application-resiliency-by-simulating-the-cloudflare-december-2025-outage-11636.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/how-to-test-application-resiliency-by-simulating-the-cloudflare-december-2025-outage>)

Author: Gavin Cahill

Published: 2025-12-19T00:00:00Z

Content type: tutorial

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [Resilience](<https://devfeed.tech/topics/resilience.md>), [incident](<https://devfeed.tech/topics/incident.md>), [Chaos Engineering](<https://devfeed.tech/topics/chaos-engineering.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [Node.js](<https://devfeed.tech/topics/node-js.md>), [Python](<https://devfeed.tech/topics/python.md>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [AWS Lambda](<https://devfeed.tech/topics/aws-lambda.md>), [Azure](<https://devfeed.tech/topics/azure.md>)

Tags: [2025](<https://devfeed.tech/tags/2025.md>), [after-the-retrospective](<https://devfeed.tech/tags/after-the-retrospective.md>), [applications](<https://devfeed.tech/tags/applications.md>), [aws](<https://devfeed.tech/tags/aws.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [azure](<https://devfeed.tech/tags/azure.md>), [c-sharp](<https://devfeed.tech/tags/c-sharp.md>), [cloud](<https://devfeed.tech/tags/cloud.md>), [cloudflare](<https://devfeed.tech/tags/cloudflare.md>), [code](<https://devfeed.tech/tags/code.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [http](<https://devfeed.tech/tags/http.md>), [incident](<https://devfeed.tech/tags/incident.md>), [internet-traffic](<https://devfeed.tech/tags/internet-traffic.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [node-js](<https://devfeed.tech/tags/node-js.md>), [outage](<https://devfeed.tech/tags/outage.md>), [python](<https://devfeed.tech/tags/python.md>)

### AI overview

This tutorial explains how to use Gremlin Failure Flags to simulate HTTP 500 errors associated with the December 2025 Cloudflare outage. It describes application-layer fault injection, the distinction from network-layer experiments, and supported deployment environments and SDK languages.

### Source excerpt

Use Gremlin Failure Flags to safely simulate 500 error codes and test resiliency to outages, like the December 5th Cloudflare incident.

## Gremlin Release Roundup 2025: Reliability across AI, on-prem, and applications

DevFeed: [Gremlin Release Roundup 2025: Reliability across AI, on-prem, and applications](<https://devfeed.tech/articles/gremlin-release-roundup-2025-reliability-across-ai-on-prem-and-applications-11684.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/release-roundup-2025>)

Author: Andre Newman

Published: 2025-12-15T00:00:00Z

Content type: release

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [on-prem](<https://devfeed.tech/topics/on-prem.md>), [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [experiments](<https://devfeed.tech/topics/experiments.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [MCP Server](<https://devfeed.tech/topics/mcp-server.md>), [telemetry](<https://devfeed.tech/topics/telemetry.md>), [SRE](<https://devfeed.tech/topics/sre.md>)

Tags: [2025](<https://devfeed.tech/tags/2025.md>), [ai](<https://devfeed.tech/tags/ai.md>), [analysis](<https://devfeed.tech/tags/analysis.md>), [experiments](<https://devfeed.tech/tags/experiments.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [features](<https://devfeed.tech/tags/features.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [mcp](<https://devfeed.tech/tags/mcp.md>), [mcp-server](<https://devfeed.tech/tags/mcp-server.md>), [no-code](<https://devfeed.tech/tags/no-code.md>), [on-prem](<https://devfeed.tech/tags/on-prem.md>), [outages](<https://devfeed.tech/tags/outages.md>), [release](<https://devfeed.tech/tags/release.md>), [releases](<https://devfeed.tech/tags/releases.md>), [sre](<https://devfeed.tech/tags/sre.md>), [telemetry](<https://devfeed.tech/tags/telemetry.md>)

### AI overview

Gremlin's 2025 release roundup describes improvements aimed at preventing outages and making reliability testing easier. Highlights include Reliability Intelligence for analyzing failures and recommending remediations, a Gremlin MCP server for querying environments through an LLM, new experiments and Failure Flags capabilities, expanded platform support, streamlined onboarding, and web UI refinements.

### Source excerpt

This year's release roundup covers our new on-prem offering, new Failure Flags features, intelligent analysis of failed experiments, and much more.

## Test serverless and application-level reliability with Failure Flags

DevFeed: [Test serverless and application-level reliability with Failure Flags](<https://devfeed.tech/articles/test-serverless-and-application-level-reliability-with-failure-flags-11715.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/test-serverless-and-application-level-reliability-with-failure-flags>)

Author: Gavin Cahill

Published: 2025-03-13T00:00:00Z

Content type: article

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [Resilience](<https://devfeed.tech/topics/resilience.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [Containers](<https://devfeed.tech/topics/containers.md>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [AWS Lambda](<https://devfeed.tech/topics/aws-lambda.md>), [Node.js](<https://devfeed.tech/topics/node-js.md>), [API](<https://devfeed.tech/topics/api.md>), [Python](<https://devfeed.tech/topics/python.md>), [airflow](<https://devfeed.tech/topics/airflow.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [go](<https://devfeed.tech/tags/go.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [java](<https://devfeed.tech/tags/java.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [latency](<https://devfeed.tech/tags/latency.md>), [mesh](<https://devfeed.tech/tags/mesh.md>), [net](<https://devfeed.tech/tags/net.md>), [node-js](<https://devfeed.tech/tags/node-js.md>), [python](<https://devfeed.tech/tags/python.md>), [resilience](<https://devfeed.tech/tags/resilience.md>), [sdk](<https://devfeed.tech/tags/sdk.md>), [serverless](<https://devfeed.tech/tags/serverless.md>)

### AI overview

Gremlin Failure Flags is presented as a generally available tool for testing application-level resilience in serverless, container, Kubernetes, and service mesh environments. It combines the Gremlin SaaS API with a sidecar or Lambda Extension and an SDK to safely introduce latency, errors, and selected data issues, while also validating observability, alerting, and automated recovery.

### Source excerpt

Run resilience tests at the application level in serverless, container, Kubernetes, and service mesh environments with Gremlin Failure Flags.

## How a major retailer tested critical serverless systems with Failure Flags

DevFeed: [How a major retailer tested critical serverless systems with Failure Flags](<https://devfeed.tech/articles/how-a-major-retailer-tested-critical-serverless-systems-with-failure-flags-11586.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/how-a-major-retailer-tested-critical-serverless-systems-with-failure-flags>)

Author: Gavin Cahill

Published: 2025-03-12T00:00:00Z

Content type: article

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [AWS Lambda](<https://devfeed.tech/topics/aws-lambda.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [systems](<https://devfeed.tech/topics/systems.md>), [Amazon EC2](<https://devfeed.tech/topics/amazon-ec2.md>), [Amazon Web Services](<https://devfeed.tech/topics/aws.md>)

Tags: [amazon-ec2](<https://devfeed.tech/tags/amazon-ec2.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [failover](<https://devfeed.tech/tags/failover.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [outage](<https://devfeed.tech/tags/outage.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [testing](<https://devfeed.tech/tags/testing.md>)

### AI overview

A case study describes how a major apparel retailer used Gremlin Failure Flags to test regional failover for a critical payment service built on AWS Lambda. Because Lambda abstracts the underlying infrastructure, conventional infrastructure-level fault injection could not reproduce a regional failure. Failure Flags enabled the retailer to run the failover test in less than 30 minutes.

### Source excerpt

Find out how Gremlin helped a major retailer test region failover for a critical service built on AWS Lambda using Failure Flags.

## Release Roundup November 2024: Reliability in the serverless and AI era

DevFeed: [Release Roundup November 2024: Reliability in the serverless and AI era](<https://devfeed.tech/articles/release-roundup-november-2024-reliability-in-the-serverless-and-ai-era-11691.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/release-roundup-november-2024-reliability-in-the-serverless-and-ai-era>)

Author: Andre Newman

Published: 2024-12-04T00:00:00Z

Content type: article

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [releases](<https://devfeed.tech/topics/releases.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [GPU](<https://devfeed.tech/topics/gpu.md>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [Network](<https://devfeed.tech/topics/network.md>)

Tags: [ai](<https://devfeed.tech/tags/ai.md>), [aws](<https://devfeed.tech/tags/aws.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [features](<https://devfeed.tech/tags/features.md>), [gpu](<https://devfeed.tech/tags/gpu.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [release](<https://devfeed.tech/tags/release.md>), [serverless](<https://devfeed.tech/tags/serverless.md>)

### AI overview

Gremlin's November 2024 release roundup highlights support for Istio service mesh experiments, a new GPU experiment for testing AI and LLM workloads, easier Kubernetes cluster onboarding, AWS PrivateLink connectivity through Marketplace, and improvements to Linux and Windows agents.

### Source excerpt

A review of the major product and feature releases from September to November 2024, including Service Mesh via Failure Flags, AWS PrivateLink in Marketplace, RM & FI scheduling improvements, and agent updates.

## Three serverless reliability risks you can solve today using Failure Flags

DevFeed: [Three serverless reliability risks you can solve today using Failure Flags](<https://devfeed.tech/articles/three-serverless-reliability-risks-you-can-solve-today-using-failure-flags-11730.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/three-serverless-reliability-risks-you-can-solve-today-using-failure-flags>)

Author: Andre Newman

Published: 2024-10-16T00:00:00Z

Content type: article

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [Resilience](<https://devfeed.tech/topics/resilience.md>), [Chaos Engineering](<https://devfeed.tech/topics/chaos-engineering.md>), [AWS Lambda](<https://devfeed.tech/topics/aws-lambda.md>)

Tags: [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [cloud](<https://devfeed.tech/tags/cloud.md>), [code](<https://devfeed.tech/tags/code.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [developer](<https://devfeed.tech/tags/developer.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [resilience](<https://devfeed.tech/tags/resilience.md>), [sdks](<https://devfeed.tech/tags/sdks.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [testing](<https://devfeed.tech/tags/testing.md>)

### AI overview

This article explains that serverless platform providers manage the reliability of the cloud, while developers remain responsible for the reliability of their application code and configuration. It presents common serverless risks involving resource limits, scaling, redundancy, dependency failures, DNS failures, and user experience, then introduces Gremlin Failure Flags as a code-level fault injection solution using SDKs, code flags, and a sidecar container or Lambda layer.

### Source excerpt

Just because your app is serverless doesn't mean you don't need to think about reliability. Learn three of the top causes of serverless failures--and how to prevent them--in our latest blog.

## Release Roundup August 2024: Set experiment guardrails with customizable RBAC

DevFeed: [Release Roundup August 2024: Set experiment guardrails with customizable RBAC](<https://devfeed.tech/articles/release-roundup-august-2024-set-experiment-guardrails-with-customizable-rbac-11686.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/release-roundup-august-2024>)

Author: Andre Newman

Published: 2024-09-09T00:00:00Z

Content type: release

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [experiments](<https://devfeed.tech/topics/experiments.md>), [Network](<https://devfeed.tech/topics/network.md>), [Linux](<https://devfeed.tech/topics/linux.md>), [Windows](<https://devfeed.tech/topics/windows.md>)

Tags: [agent](<https://devfeed.tech/tags/agent.md>), [dns](<https://devfeed.tech/tags/dns.md>), [experiment](<https://devfeed.tech/tags/experiment.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [features](<https://devfeed.tech/tags/features.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [integration](<https://devfeed.tech/tags/integration.md>), [release](<https://devfeed.tech/tags/release.md>)

### AI overview

Gremlin's August 2024 release roundup introduces customizable role-based access controls, improved agent capabilities, per-team private network integrations, enhanced dependency detection, and a simpler Failure Flags experiment creation interface. It also highlights improved proxy support and more targeted availability-zone experimentation.

### Source excerpt

Custom role-based access controls (RBAC), improved proxy support, zone tags for Failure Flags, and much more! It's all here in our August 2024 release roundup.