feat(transactions): Add transaction_info.source [INGEST-1427]

[jjbayer]

Add a source label to every transaction that indicates how the transaction name was generated, as decided in https://www.notion.so/sentry/Annotating-Transaction-Names-a08a05ff97b348b0903de03a17baa731.

Rendered version is here and will be included on the "Transaction Type" page.

[vercel]

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Name	Status	Preview	Updated
develop	✅ Ready (Inspect)	Visit Preview	Jul 1, 2022 at 0:18AM (UTC)

[jan-auer]

Should we also update other places, such as:

• Unified API: add the source as internal second parameter
• Guidelines for Performance Monitoring: Mention that the transaction source should be set.

[jjbayer]

Should we also update other places, such as:

• Unified API: add the source as internal second parameter
• Guidelines for Performance Monitoring: Mention that the transaction source should be set.

@jan-auer I added a reference in "Guidelines for PM". Not sure about the Unified API, do you mean as a second parameter to set_transaction()? Would this not automatically become public API? I assume we want to prevent the user from setting the source themselves.

[jan-auer]

Redirecting this question to @AbhiPrasad. Would you expect "internal" APIs into the Unified API docs, for example the optional argument for setting a transaction with source?

[untitaker]

I think we should add this to the public docs, after all SDKs need to know how to send this