Difficulties / Bugs with Canvas

[tsullivan (Tim Sullivan)]

@Rob_wylde

• When I try and print a workpad to pdf. Only a single page is printed to pdf.
  You can repo this by simply opening a new template and trying to print to pdf. Expected result is for all pages to be included but I only get a single page. If i add the post url to a watcher i'll get what seems like a random single page being outputted.

Hi, this is a known issue and it will be fixed in 7.6.1: [Reporting] Fix screenshot pipeline for multi-page by tsullivan · Pull Request #56928 · elastic/kibana · GitHub (It was totally my fault too - sorry about that!)

@Rob_wylde

I try and upload an image to my assets and even though only 3% of space is being used i get an error.
The server gave a response that the workpad data was too large. This usually means uploaded image assets that are too large for Kibana or a proxy.
This file is 535kb and i've been able to successfully add it to another workpad.

Whenever you make any changes to the workpad, the entire workpad gets re-uploaded to Elasticsearch for auto-saving. Canvas maintains the workpad as a single string of JSON, with the images converted to base64 format.

It sounds like the overall size of the workpad is pretty high for Elasticsearch, or a proxy server in front of Elasticsearch. Elasticsearch has a setting to limit the size of HTTP payloads at http.max_content_length: HTTP | Elasticsearch Guide [8.11] | Elastic

If the size of the workpad isn't hitting the ES size limit, it could be hitting a limit of a 3rd party proxy server in front of Elasticsearch.