[v1.4] Manifest v8: reflect changes from node cleanup

[jtcohen6]

Contributions

• I have read the contribution docs, and understand what's expected of me.

Link to the page on docs.getdbt.com requiring updates

• https://docs.getdbt.com/reference/artifacts/manifest-json
• "Breaking changes" section of v1.4 migration guide (to be initialized: Initiatilize v1.4 [first beta] #2427). This should only be relevant for a very small subset of users, but worth calling out all the same.

What part(s) of the page would you like to see updated?

Top of manifest page: v8 (text + link)

Notes:

• We still need to generate the v8 schema + add it to schemas.getdbt.com (Add schema for manifest v8 schemas.getdbt.com#16)
• The page currently says + links to v6 — it should be v7!
• ❓ Should this part of the page use VersionBlock, to show the corresponding manifest version for the dbt-core version selected in the dropdown?? Maybe — that might be more work than this is worth

Then, in the migration guide, we should add a note similar to the one we've had for past versions:

For consumers of dbt artifacts (metadata)

The manifest schema version has updated to v8. The relevant changes are...

These changes are relevant for users who:

• parse/analyze contents of manifest.json
• have custom code accessing the model or graph variables. For example:

{{ model.root_path }}

Relevant changes:

• root_path removed for all nodes
• remove some irrelevant/unused attributes from seed nodes, including depends_on
• macros no longer have tags
• docs blocks unique IDs now start with doc (consistency!)

Additional information

dbt-labs/dbt-core#6172
dbt-labs/dbt-core#6427

[jtcohen6]

resolved by #2662 + #2646