Add EX Performance metrics doc#3055
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to define a better mapping between the spec and implementation.
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Pull request overview
This PR adds a new documentation file specifying performance metrics for the EX (Element X) application. The document outlines how performance metrics will be tracked using Sentry, including UX metrics, technical metrics, and additional contextual data to better understand application performance.
- Defines UX metrics (cold start, catch-up, notification to message, open a room, send a message) tracked as Sentry transactions
- Specifies additional data points to collect (device information, homeserver, database file sizes, account size)
- Outlines technical metrics tracked as Sentry spans and identifies future considerations for additional UX metrics
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We made a review with @mxandreas: - `Cold start` --> `Cached Room list` - `Catch-up` --> `Up-to-date room list` - Remove the `What is it measuring?` column that has duplicated info.
stefanceriu
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Jan 30, 2026
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This is now implement for iOS in element-hq/element-x-ios#5020
lgtm 👍
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to specify those metrics.
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