Add the otelcol tcplog receiver

[nosammai]

PR Description

This PR adds support for the otelcol tcp log receiver. I am not much of a golang programmer, so this PR was largely adapted from the one that added the syslog receiver.

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

[CLAassistant]

All committers have signed the CLA.

[ptodev]

Thank you! It looks good. I only added a few minor comments.

[nosammai]

Thanks for the review! Updated the PR based on your feedback.

For the max log size stuff - I pulled all of that out of the syslog receiver, so it might be worth going and making the same changes there as well at some point.

[nosammai]

Hmmm I can't get the test that's failing in CI to fail locally no matter how many times I run it.

I didn't copy this sleep over from the equivalent syslog test because that PR had been merged and it was passing locally. Do you think that would help?

https://github.com/nosammai/alloy/blob/otel-tcp-log-receiver/internal/component/otelcol/receiver/syslog/syslog_test.go#L61-L62

[dehaansa]

Hmmm I can't get the test that's failing in CI to fail locally no matter how many times I run it.

I didn't copy this sleep over from the equivalent syslog test because that PR had been merged and it was passing locally. Do you think that would help?

https://github.com/nosammai/alloy/blob/otel-tcp-log-receiver/internal/component/otelcol/receiver/syslog/syslog_test.go#L61-L62

We attempted to remove the test after that PR was merged and it still failed in CI, so it might be relevant here as well. Haven't had the opportunity to go back and wait for the port to be ready in a better way than just the 1s wait.

[clayton-cornell]

Most doc suggestions are style related to bring this new topic in-line with the new/upcoming markdown styles and information flow.

A few minor content corrections were included.

[ptodev]

Apologies for the delay with the review! I added just one minor comment. It'll also need a rebase with main and it would be ready for merging!

[ptodev]

I'm sorry, the main branch got an updated OTel version and now this receiver will need to be updated too... If you want to I can rebase your branch and update it? I feel bad for asking you to rebase so many times 😅

[nosammai]

No problem - rebased and updated to 0.119

[dehaansa]

We should consider adding operators to the receiver (like filelogreceiver #2711 ) to ensure the full capacity of the stanza pipeline that underlies the otel log receivers.

This was not done when syslogreceiver was added due to some issues I had with the implementation, but resolved when adding filelog. I'm intending to add it to syslog before next release, so I can add it to tcplog later as well if you don't have capacity to add it in with this PR.

[nosammai]

If you don't mind adding it in afterwards, I would appreciate that

[nosammai]

The build failure looks like a transient 502 from yarn. I don't think I have permission to retrigger the builds