📣 Notifier
Overview
In GO Feature Flag, a notifier is a component that informs you about changes in the feature flag configuration.
It's distinct from exporters, which handle the results of flag evaluations. Notifiers focus on changes to the configuration itself.
About notifiers
When the GO Feature Flag client detects a change in the configuration through the retriever's polling mechanism, it triggers the configured notifiers. The notifier then sends a notification to the specified destination.
Notifiers are useful for a variety of purposes, such as:
- Information: Notifiers can send to your team chat a notification that a feature flag has changed.
- Reacting to flag changes: Using the webhook notifier, you can trigger any action you want in your system to react to flag changes.
By nature, GO Feature Flag is 100% stateless, so if you run multiple instance of GO Feature Flag, you will receive notification for changes from each instance.
In each notification you will have the hostname of the instance, it can be useful if you have multiple GO Feature Flag running.
Key Differences Between Notifiers and Exporters
| Feature | Notifiers | Exporters |
|---|---|---|
| Purpose | Notify about configuration changes | Export flag evaluation results. |
| Trigger | Configuration update detected by retriever | Flag evaluation (e.g., calling BoolValue()). |
| Data Sent | Information about the configuration change | Flag name, variation, user context, timestamp. |
| Use Cases | Informing about configuration changes | Analytics, monitoring flag usage, debugging. |
Supported notifiers
- Slack
- Discord
- Microsoft Teams
- Webhook
- Log