It’s experimental in 1.3 i.e. use “istioctl x manifest apply”
Jaid, regarding using Helm vs. istioctl, for new installations we do recommend istioctl. Although istioctl upgrade is experimental in 1.4, we plan to move it to beta in 1.5 - so you will be able to use upgrade to go from 1.4 to 1.5 without any issues.
For upgrading patch versions, I don’t think there should be any problem with upgrade; patch versions typically don’t make any API changes and most of upgrade command functionality is around checking for API changes during upgrade. We do plan to test upgrade command for 1.4.x -> 1.4.(x+1) and any errors are likely to be of the flavor of “cannot find this field to validate against the schema”, not something that would actually break your install.
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