Set Up Session Replay

Session Replay helps you get to the root cause of an error or latency issue faster by providing you with a reproduction of what was happening in the user's device before, during, and after the issue. You can rewind and replay your application's state and see key user interactions, like taps, swipes, network requests, and console entries, in a single UI.

By default, our Session Replay SDK masks all text content, images, and user input, giving you heightened confidence that no sensitive data will leave the device. To learn more, see product docs.

Pre-requisites

Make sure your Sentry Cocoa SDK version is at least 8.31.1

Install

If you already have the SDK installed, you can update it to the latest version with:

.package(url: "https://github.com/getsentry/sentry-cocoa", from: "8.38.0"),

Set Up

To set up the integration, add the following to your Sentry initialization.

SentrySDK.start(configureOptions: { options in
  options.dsn = "https://examplePublicKey@o0.ingest.sentry.io/0"
  options.debug = true

  // Currently under experimental options:
  options.experimental.sessionReplay.onErrorSampleRate = 1.0
  options.experimental.sessionReplay.sessionSampleRate = 1.0
})

Verify

While you're testing, we recommend that you set sessionSampleRate to 1.0. This ensures that every user session will be sent to Sentry.

Once testing is complete, we recommend lowering this value in production. We still recommend keeping onErrorSampleRate set to 1.0.

Sampling

Sampling allows you to control how much of your website's traffic will result in a Session Replay. There are two sample rates you can adjust to get the replays relevant to you:

1. sessionSampleRate - The sample rate for replays that begin recording immediately and last the entirety of the user's session.
2. onErrorSampleRate - The sample rate for replays that are recorded when an error happens. This type of replay will record up to a minute of events prior to the error and continue recording until the session ends.

Sampling begins as soon as a session starts. sessionSampleRate is evaluated first. If it's sampled, the replay recording will begin. Otherwise, onErrorSampleRate is evaluated and if it's sampled, the integration will begin buffering the replay and will only upload it to Sentry if an error occurs. The remainder of the replay will behave similarly to a whole-session replay.

Privacy

The SDK aggressively records the app and masks all text and images. Please don't turn it off if you have sensitive data in your app. If you want to manually mask parts of your app's data, read our guide on custom masking.

To disable redaction altogether (not to be used on applications with sensitive data):

options.experimental.sessionReplay.redactAllText = false
options.experimental.sessionReplay.redactAllImages = false

Error Linking

Errors that happen while a replay is running will be linked to the replay, making it possible to jump between related issues and replays. However, it's possible that in some cases the error count reported on the Replays Details page won't match the actual errors that have been captured. That's because errors can be lost, and while this is uncommon, there are a few reasons why it could happen:

• The replay was rate-limited and couldn't be accepted.
• The replay was deleted by a member of your org.
• There were network errors and the replay wasn't saved.

FAQ

Q: Does Session Replay work with SwiftUI? A: Yes. It works with both UIKit and SwiftUI.

Q: What's the lowest version of iOS supported? A: Session Replay recording happens even on the lowest version supported by the Sentry SDK. (Today that's iOS 12.)