Out of the box, Kibana is unable to export and import all saved objects because of Canvas template

[rudolf]

Kibana version: 7.9.0+

1. Fresh install of Kibana
2. Export all saved objects from Management -> Saved Objects -> Export
3. Try to restore your export by importing those objects

Importing fails because the exported file is > 11MB which is bigger than our default of 10MB for savedObjects.maxImportPayloadBytes. Almost all of this comes from the Canvas pitch presentation template: #69438

Although we want to keep savedObjects.maxImportPayloadBytes relatively low for security reasons we can probably bump it higher. However, putting static image data into a saved object doesn't seem like a good fit and when a single saved object is this large it can have negative effects on other parts of Kibana (slowing down saved objects management UI, making migrations more likely to fail).

Can't we move these large images that come with the default templates into x-pack/plugins/canvas/public/assets and serve them from /plugins/canvas/assets/{path*}?

[elasticmachine]

Pinging @elastic/kibana-canvas (Team:Canvas)

[rudolf]

Related to #46819 and #36126 (comment). While we can increase the default limit to match canvas' old API (25MB) to allow users to create larger workpad templates, I don't believe kibana should ship with ~10MB saved objects out of the box.

[rudolf]

Also worth mentioning that even if we increase the limit, this limit is not per object but per import file. So even if we increase the limit, if a user makes 3 copies of the default template they will again be unable to import their NDJSON file.

[clintandrewhall]

@rudolf Would you consider this a duplicate of #66129 ?

[rudolf]

Yes, closing in favour of #66129