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Copy file name to clipboardExpand all lines: src/connections/destinations/catalog/actions-google-analytics-4/index.md
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@@ -64,6 +64,7 @@ Segment’s spec doesn't have an equivalent event for every Google Analytics 4 r
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#### Custom Events
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In addition to recommended events, you can also send custom events using the [Custom Event action](/docs/connections/destinations/catalog/actions-google-analytics-4/#custom-event). Custom events are events that you name. Custom events don't appear in most standard reports; you need to set up custom reports for meaningful analysis. To create custom events in the Google Analytics 4 web interface, see Google’s [Modify and create events through the user interface](https://support.google.com/analytics/answer/10085872){:target='_blank'}.
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> Don’t create custom events that already correspond to the pre-built mappings that Segment has. Use the standard events defined in [GA4’s doc](https://developers.google.com/analytics/devguides/collection/ga4/reference/events){:target="_blank"} with their corresponding actions.
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#### Custom Dimensions and Metrics
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With Google Analytics 4, you must create custom dimensions and metrics within the Google Analytics 4 interface and link parameters to the corresponding dimension or metric. When you create the dimension or metric, you can either select a parameter from the list of already collected fields or enter the name of the parameter you plan to collect in the future. Custom dimensions can be either event-scoped or user-scoped, and custom metrics must be event-scoped.
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> info "Event naming limitations"
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> Google Analytics 4 requires that all event names contain only alpha-numeric characters and underscores, and must start with an alphabetic character. Segment replaces spaces in Event Names with an underscore, so that these events are accepted by GA4. For example, Segment renames an event named `Home Profile` to `Home_Profile`. In some cases, GA4 may reject an event outright, due to unsupported characters. For example, an event named `Home | Profile` will be silently rejected due to the pipe character.
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> In all cases, event names in GA4 are case sensitive. The Custom Event action includes a **Lowercase Event Name** option, to ensure consistency of all events sent to Google. For more information, see Google's articles [Google Analytics 4 event name rules](https://support.google.com/analytics/answer/10085872?hl=en&ref_topic=9756175#event-name-rules){:target='_blank'} and [Event name limitations](https://developers.google.com/analytics/devguides/collection/protocol/ga4/sending-events?client_type=firebase){:target="_blank"}.
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#### Custom Dimensions and Metrics
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With Google Analytics 4, you must create custom dimensions and metrics within the Google Analytics 4 interface and link parameters to the corresponding dimension or metric. When you create the dimension or metric, you can either select a parameter from the list of already collected fields or enter the name of the parameter you plan to collect in the future. Custom dimensions can be either event-scoped or user-scoped, and custom metrics must be event-scoped.
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To send parameters to Google Analytics 4, use the Event Parameters or User Properties object available on every action. Only pass flat key-value pairs in the Event Parameters and User Properties objects. Keep in mind that Google silently drops any events that include nested parameters.
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To achieve parity with Universal Analytics, you should create the same custom dimensions that you defined in Universal Analytics. Additionally, in Google Analytics 4, you should recreate many of the values that you tracked as event dimensions in Universal Analytics, particularly event category and event label. For more information, see [Google Analytics 4 Custom dimensions and metrics](https://support.google.com/analytics/answer/10075209){:target='_blank'}.
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#### Tracking Active Users and Sessions
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The Google Analytics 4 reports only display active users who engage with your site for a non-zero amount of time. To ensure users are rendered in reports, Segment sets the `engagement_time_msec` parameter to 1 by default. If you track engagement time on your Segment events, you can use the **Engagement Time in Milliseconds** field mapping to set `engagement_time_msec` to a different value.
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#### Tracking Active Users and Sessions
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The Google Analytics 4 reports only display active users who engage with your site for a non-zero amount of time. To ensure users are rendered in reports, Segment sets the `engagement_time_msec` parameter to 1 by default. If you track engagement time on your Segment events, you can use the **Engagement Time in Milliseconds** field mapping to set `engagement_time_msec` to a different value.
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If you choose to integrate with Google Analytics 4 client-side (using Gtag outside of Segment) _and_ also use Segment's Google Analytics 4 destination to send events through the API, you can track sessions server-side. When using Gtag, [Google generates a `session_id` and `session_number` when a session begins](https://support.google.com/analytics/answer/9191807?hl=en){:target='_blank'}. The `session_id` and `session_number` generated on the client can be passed as Event Parameters to stitch events sent through the API with the same session that was collected client-side.
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> info "Session tracking limitations"
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> Session tracking server-side only works if you're also sending data to Google Analytics 4 client-side. This is because the `session_id` must match a value that was previously collected on the client. For events to stitch properly, they must arrive within a 48 hour window of when the client-side events arrived.
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> Google doesn't currently support passing other reserved fields, such as [predefined user dimensions](https://support.google.com/analytics/answer/9268042?hl=en&ref_topic=11151952){:target='_blank'} or device-specific information, to the Measurement Protocol API.
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#### User Identification
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-**Use the Gtag-generated Client ID.** Gtag will set a Client ID automatically. The Client ID is stored in a cookie and can be fetched on the web client. To tie data between client-side and server-side, pass the Gtag-generated Client ID to Segment as a property and use that value as the Client ID in the Google Analytics 4 destination mappings.
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-**Use the Segment `userId` for User-ID.** The Segment `userId` should be your company’s canonical user identifier. By setting Google's User-ID to the same value as `userId` on client-side and server-side, you can benefit from cross-platform analytics.
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In addition, if you use [Firebase to send mobile data to Google Analytics 4](/docs/connections/destinations/catalog/actions-google-analytics-4/#mobile-data), using the same User-ID across web and mobile will ensure users are stitched together across devices.
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#### Validating and Comparing Data
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Google recommends a period of dual-collection with both Universal Analytics and Google Analytics 4. This dual-collection approach lets you build a historical record in Google Analytics 4 while continuing to depend on Universal Analytics until you're ready to fully switch over.
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