Increase maxPayloadBytes on Saved Object API for Canvas Workpads

[timductive]

Describe the feature:
Currently the default limit for the Saved Object API is 10MB, many Canvas workpads exceed this limit and can't be uploaded via the Saved Object API. Canvas has an internal API that overrides the limit to 25MB, ideally we could use the Saved Object API both internally and externally and users could override this limit.

[elasticmachine]

Pinging @elastic/kibana-app-arch

[elasticmachine]

Pinging @elastic/kibana-canvas

[timductive]

related to #43678

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[pgayvallet]

Once #50321 lands, we could increase the maxBytes option of saved object routes, either with a static value or an actual config property.

• Is there any reason not to do so?
• What actual value make sense?
• Which SO routes should actually impacted?

CC @rudolf @joshdover

EDIT: once #50321 lands, server.maxPayloadBytes should actually be applied by default to SO routes. The question of increasing it by default still remains.

[mshustov]

We use the same Hapi instance for both the New & Legacy platforms. It means that default value server.maxPayloadBytes: 1Mb is used for all routes.
SO routes are declared in the Legacy platform. We can adjust payload value on a route base already now
https://github.com/elastic/kibana/blob/master/src/legacy/server/http/integration_tests/max_payload_size.test.js#L32

Or you are talking about maxImportPayloadBytes ? Which is used for /api/saved_objects/_import and /api/saved_objects/_resolve_import_errors with default 10Mb
https://github.com/elastic/kibana/blob/master/src/legacy/server/config/schema.js#L253

[ThomThomson]

Closing this for the moment as not planned. We can re-open again if it becomes a priority to increase this limit