Multiple tracking IDs

[reslear]

Describe the feature

multiple trackingIds in config:

id: string | string[] - (id) => [].contact(id).foreach((_id) => gtag('config', _id))

and add sugar method for runtime - configureTrack.

https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-google-gtag/src/gatsby-ssr.js#L65

also maybe need add sugar method to get clientId and prevent duplications https://www.analyticsmania.com/post/get-google-analytics-client-id/

Additional information

• [X] Would you be willing to help implement this feature?
• [ ] Can you think of other implementations of this feature?

Final checks

• [X] Check existing issues.

[johannschopplich]

Good idea. Should be pretty straight forward to implement. PR welcome! 🙂

[reslear]

also good implementation https://github.com/facebook/docusaurus/blob/7dcad0c6322c87131f9f39cbc4e765b0e1119fe8/packages/docusaurus-plugin-google-gtag/src/index.ts

[vietanhbui]

+1