Remove the --logformat flag

[codebien]

What?

Removed the deprecated --logformat flag, the --log-format alternative should be used.

Why?

Deprecation process.

[olegbespalov]

We need to migrate first: https://github.com/search?q=org%3Agrafana%20--logformat&type=code

[mstoykov]

Given that this is still so widely used it might be worth postponing this a release or three after we remove it everywhere.

This isn't really a problem we need to fix, but breaking user experiecne is not great if until yesterday we were telling them to a thing .

[codebien]

This isn't really a problem we need to fix, but breaking user experiecne is not great if until yesterday we were telling them to a thing .

If you use --logformat then you get a clear message about the deprecation, and apparently, we added it 10 versions ago.

$ k6 run --logformat raw ./examples/http_get.js
Flag --logformat has been deprecated, log-format

I value it more visible than the writing we did in the release notes. So, I'm for fixing the other occurrences and removing it in the current version, if someone didn't fix it till now then I wouldn't expect that giving them more versions will make a difference.

[olegbespalov]

In my opinion, I don't think that we need to postpone this shrug: We need to fix usage, and we have plenty of time.

However, I might think that following v0.48 could be one of the biggest from the perspective of breaking changes 😅

[codebien]

@olegbespalov the other parts have been changed, we should be now ready to merge this.

[olegbespalov]

🚀

[codebien]

@oleiade as @mstoykov is on PTO, I add you as a reviewer.