Metrics question

What are the success metrics for Facebook Rooms?

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What this question tests

Metrics thinking for a social feature: defining a measurable success framework for a group video calling product.

Clarify the product: Facebook Rooms, a group video chat feature allowing multiple friends to drop in and out.
Define the north star metric, such as weekly active minutes spent in Rooms per user.
Break into a funnel: rooms created, invites sent, participants joined, and average session length.
Add quality guardrails, like call drop rate and audio/video quality complaints.
Add a virality metric, like average number of participants per room, since Rooms is inherently social and multi-user.

Adds a virality-specific metric (average participants per room), reflecting the unique multi-person nature of Rooms versus 1:1 calling.
Distinguishes creation metrics (rooms started) from engagement metrics (time spent), showing funnel thinking.
Names a concrete guardrail, like call quality complaints, relevant to any real-time communication product.
Uses an assumed metric, e.g. targeting an average of 4 participants per active room.

Treating Rooms like a standard 1:1 video call product with no multi-person specific metrics.
Ignoring call quality guardrails entirely.
Picking a vague north star like 'engagement' with no specific definition.

How would you measure whether Rooms is cannibalizing or complementing 1:1 Messenger calls?
What would you do if rooms are created often but rarely joined by more than one person?
How would you define a 'successful' room session?