What's Supported in Harness Feature Flags

Platforms and technologies supported by Harness Feature Flags

ROADMAP UPDATE

New roadmap items are now tracked under Feature Management and Experimentation (FME), which extends the capabilities previously delivered through Harness Feature Flags. Visit the Product Roadmap for Harness FME to see what's coming next.

Harness Feature Flags support client-side and server-side SDKs for a number of programming languages.

Supported client-side SDKs

The following table lists the client-side Feature Flag SDKs that Harness supports.

SDK	Documentation
Android	Android SDK Reference
iOS	iOS SDK Reference
Flutter	Flutter SDK Reference
Javascript	Javascript SDK Reference
React Native	React Native SDK Reference
Xamarin	Xamarin SDK Reference
React Client	React Client Reference
React Native	React Native Reference

Supported server-side SDKs

The following table lists the server-side Feature Flag SDKs that Harness supports.

SDK	Documentation
.NET	.NET SDK Reference
Go	Go SDK Reference
Java	Java SDK Reference
Node.js	Node.js SDK Reference
Python	Python SDK Reference
Ruby	Ruby SDK Reference
Apex	Apex SDK Reference
Erlang	Erlang SDK Reference
PHP	PHP SDK Reference

Relay Proxy

The Relay Proxy, which allows for offline and hybrid Feature Flags usage, is provided as a Docker image and can be used in any environment where the Docker image can be run. The Relay Proxy can be enhanced with Redis as a cache in environments where this is possible.

Hybrid and offline usage

Harness Feature Flags allows for both completely offline usage as well as hybrid usage via the relay proxy. Hybrid usage can be in the form of:

• The application is online and only talks to the Relay Proxy, while the Relay Proxy has connectivity to Harness.

• The Relay Proxy is bundled with the application at build-time with a working configuration file, and neither the application nor the Relay Proxy have connectivity to Harness.

Cloud limitations

There are no limitations for using Feature Flags in any cloud or non-cloud environment as long as the languages needed are supported with an SDK, and connectivity to either Harness or the Relay Proxy can be established.

For information about what's supported for other Harness modules and the Harness Platform overall, go to Supported platforms and technologies.

Resource Limits

Resource	Limit	Description
Flags	1200	Number of flags per project
Targets	60 days	Number of targets per environment are retained for up to 60 days. Targets referenced in rules do not get removed
Target Groups	1200	Number of groups of targets per environment
API Keys	10	Number of api keys created per environment
Flag Target Rules	2000	Number of target rules on a flag (e.g. serve target x true)
Flag Target Group Rules	1000	Number of target group rules on a flag (e.g. server group beta true)
Target Group Include/Exclude Rules	5000	Number of targets directly included/excluded in a target group
Target Group Custom Rules	5000	Number of custom rules in a target group (e.g. if identifier == “foo”)
Target Group Clause Sizes	5000	Number of clauses in a group rule