feat(influx): extend CLI with versoin and user-agent

[jsteenb2]

Closes: #18336
Closes: #14821

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Acceptance Criteria

• all http calls from influx CLI have a User-Agent header
• User-Agent header should look like User-Agent: influx/$VERSION (<system-information>) Sha/$SHA Date/$BUILD_DATE

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• CHANGELOG.md updated with a link to the PR (not the Issue)
• Well-formatted commit messages
• Rebased/mergeable
• Tests pass

[mark-rushakoff]

Fly-by comment: this isn't the build date (as noted in the PR description); it's the time that the influx process was started.

[jsteenb2]

you're right. I borrowed this from the influxd binary here:

https://github.com/influxdata/influxdb/blob/master/cmd/influxd/main.go#L27

just noticed I dont' have the fmt.Sprintf, but that shouldn't matter yah?

It looks like the date isn't provided as an LD flag either, so that definitely can change 🤔. What do you think is the best way forward here?

[mark-rushakoff]

Agreed the fmt.Sprint isn't necessary; time.Format already returns a string.

I think setting the date at link time is the correct approach.

[mark-rushakoff]

Looks like we do set the date as a linker flag in goreleaser after all:

influxdb/.goreleaser.yml

Line 19 in d21fce5

ldflags: -s -w -X main.version={{.Version}} -X main.commit={{.ShortCommit}} -X main.date={{.Date}}

influxdb/.goreleaser-nightly.yml

Line 19 in d21fce5

ldflags: -s -w -X main.version={{.Version}} -X main.commit={{.ShortCommit}} -X main.date={{.Date}}

Any tooling we have to inspect the resulting date would know that version == "dev" indicates the date would be meaningless.

Nothing to change here after all.