PostHog/posthog

group flags that target groups should have default insights that only show `$feature_flag_called` events with groups associated with them

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#39135 opened on Oct 4, 2025

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 (3 comments) (0 reactions) (0 assignees)Python (16,704 stars) (988 forks)batch import
good first issueteam/feature-flags

Description

right now, we create default insights for feature flags, but if a feature flag targets groups, we should tailor that default insight to only show $feature_flag_called events that have groups set on them, since otherwise these events don't really evaluation traffic to this flag (i.e. it can make the rollout percentages seem confusing since the amount of false events (just bc there are no groups) will be way larger than expected)

Folks have been confused about this: https://posthog.slack.com/archives/C075EH38BR8/p1759134575502819

Contributor guide

Tech stack
pythonpostgresql
Domain
backendanalytics
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Understanding of PostHog feature flagsFamiliarity with default insights creationKnowledge of event properties filtering
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
The issue is to modify the default insight creation for feature flags that target groups. Look into how default insights are generated for feature flags (likely in plugin or insight creation code) and add a filter to only include $feature flag called events that have a 'groups' property. The Slack thread referenced (C075EH38BR8) may contain further details. Check the feature flag model and the default insight generation logic.