Feature Statistics

The Statistics tab on a feature shows how much traffic the feature is receiving and which variants your users are being served, per environment, over the last 30 days.

What is an impression?

An impression is recorded every time an SDK evaluates the feature for a user — that is, every call to evaluate('my-feature') that resolves a variant. SDKs batch impressions and send them to Featureflow in the background, so counts can take a short while to appear after traffic starts flowing.

A few things to keep in mind:

• Impressions count evaluations, not unique users. A single user who triggers ten evaluations produces ten impressions.
• Impressions are recorded per environment — use the environment switcher at the top right of the tab to move between them.
• No impressions usually means the feature code path isn't being reached, the SDK isn't initialised in that environment, or the API key belongs to a different environment.

Reading the tab

• Total Impressions — the total number of evaluations in the selected environment over the last 30 days.
• Variant Distribution — how those impressions break down per variant (for a simple boolean feature, on vs off), with counts and percentages. This is the quickest way to confirm a gradual rollout is serving roughly the split you configured.
• Daily Impressions chart — a stacked area chart of impressions per day, per variant. Hover to inspect individual days.

What statistics are used for

Beyond monitoring, impression data drives Featureflow's automated housekeeping:

• A feature that starts receiving traffic in a non-production environment moves from Created to Development on its lifecycle timeline.
• A non-permanent feature that has been serving 100% of production traffic to a single variant for longer than its stale period is flagged as Stale — a prompt to remove the flag from your code and archive it.

Common checks

Question	Where to look
Is my rollout split actually 20/80?	Variant Distribution percentages
Did the feature stop being used?	Daily Impressions chart trailing off
Is the SDK wired up in this environment?	Total Impressions > 0 for that environment
Is it safe to archive this feature?	All environments show a single variant (or no recent traffic)