🐛 Multiple Apps unexpected loss of service

[Gary-H9]

Describe the bug.

A number of users have reported unexpected loss of service / pod-restart.

To Reproduce

Hypothesis is that this occurs when auto-reconnections are fired many times.

Expected Behaviour

Apps should not spontaneously restart. Working hypothesis in this Slack thread.

Additional context

This is occurring on:

• pfg-dash-moj - original ticket
• gold-scorecard-form
• prison-network-app

[Gary-H9]

Captured Joe's app in the main body of the ticket.

[michaeljcollinsuk]

The POC using open source shiny server was tested on gold-scorecard-form app from 19/10/23 to 23/10/23. This testing went well, we found the following:

• websocket connection times are still inconsistent, but the reconnection behaviour is much improved
• user remains in the same place when the reconnection occurred, the scorecard is not reloaded, and changes are not lost

App owner was happy with these changes, and deployed to the production environment on 24/10/23.

Our next step is to create a new base image that captures the amendments we made to the open-source server. We will then be able to test this image with the other apps mentioned in this ticket (pfg-dash-moj and https://github.com/ministryofjustice/data-platform-support/issues/265)

[michaeljcollinsuk]

Opened PR's to deploy the new base image to the prison-network-app and pfg-dash-moj app:

https://github.com/ministryofjustice/prison-network-app/pull/129
https://github.com/ministryofjustice/pfg-dash-moj/pull/275

Currently awaiting feedback from the app owners

[joeprinold]

@michaeljcollinsuk and @ymao2 a similar issue seems to be occurring on a couple of our other apps. Should I just go ahead and apply the fix to those apps or is that something that you'd want to review first?

[ymao2]

@joeprinold we have written the guide about how to migrate to use new open-source shiny server
https://user-guidance.analytical-platform.service.justice.gov.uk/apps/rshiny-app.html#open-source-shiny-server

so, Yes, you can go ahead to apply the fix, if you encounter any issue during the process, just raise a new support issue.