Documentation: serverExposureStrategy missing performance impacts

[Hadsch]

At least on kubernetes, the setting serverExposureStrategy has a huge impact on the startup time of a workspace.

Here you can see a comparison (credits to @sparkoo):
https://www.youtube.com/watch?v=Fhzt8DiBajU
Link to the comment: #19461 (comment)

Option	Startup-Time
single-host, type 'gateway'	17 sec
multi-host, type 'ingress'	55 sec
single-host, type 'ingress'	66 sec

Depending on which option you choose, the start time of a workspace can be increased or decreased by about 40 seconds.
In my opinion, this is a huge design decision that is not covered in the docs.

This is the page for the serverExposureStrategy:
https://www.eclipse.org/che/docs/che-7/installation-guide/configuring-workspace-exposure-strategies/

Expected documentation

Performance impact for each option

Note: This might be different on MiniKube or on OpenShift. But at least for Kubernetes this setting should be considered during the setup.

[ibuziuk]

@Hadsch thanks for sharing the performance impact. Indeed single-host / gateway (the default one) is by far the fastest option from the workspace startup perspective. Would you be interested in contributing the performance impact warning to che-docs - https://github.com/eclipse-che/che-docs ?

[l0rd]

@Hadsch what version of Che are you using? single-host using gateway should be the only option since 7.42 (when the switch to DevWorkspace happened). @sparkoo can you confirm?

[Hadsch]

Currently we are on 7.39.1 but we plan to update soon.

@l0rd + @ibuziuk: If its true, that this is the only option I think we can close this ticket. Otherwise, of course I can give it a try ;)

[sparkoo]

@Hadsch what version of Che are you using? single-host using gateway should be the only option since 7.42 (when the switch to DevWorkspace happened). @sparkoo can you confirm?

yes, devworkspaces runs only on gateway single-host. We should update the docs (I believe big docs refactorings for devworkspaces are in progress).

[Hadsch]

@l0rd: If it is the only option since 7.42 than it would still be the question why all three options are described?

[sparkoo]

@l0rd: If it is the only option since 7.42 than it would still be the question why all three options are described?

switch to devworkspaces is big update and docs haven't catch up yet

[Hadsch]

Perfect, then I will close the ticket now!

[l0rd]

Yes, big documentation refactoring / clean up is in progress #21264