add syslog receiver support

[wph95]

Description: Add Syslog receiver
Link to tracking Issue: #2331

Testing: Unit tests are included

Documentation: Syslog receiver README.md is included

[wph95]

opentelemetry-log-collector syslog parser has a bug
open-telemetry/opentelemetry-log-collection#31
wait for it fixed

[djaglowski]

Overall looks great. A few comments, and one more blocker on log-collection repo.

[tigrannajaryan]

@wph95 thank you for working on this. I will assign the issue to you. Please remember to claim issues if you want to work on them in the future.

We will also need a perf test for syslog receiver. If you do not plan on implement a perf test in this PR please create a separate issue for that.

[wph95]

@wph95 thank you for working on this. I will assign the issue to you. Please remember to claim issues if you want to work on them in the future.

We will also need a perf test for syslog receiver. If you do not plan on implement a perf test in this PR please create a separate issue for that.

thx Tigran, next time will claim issues first :)
will create a perf test issue for syslog receiver

[codecov]

Codecov Report

Merging #2482 (dfa5708) into main (fcbe766) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2482      +/-   ##
==========================================
+ Coverage   91.48%   91.51%   +0.02%     
==========================================
  Files         440      441       +1     
  Lines       21864    21887      +23     
==========================================
+ Hits        20002    20029      +27     
+ Misses       1393     1390       -3     
+ Partials      469      468       -1     

Flag	Coverage Δ
integration	69.18% <ø> (ø)
unit	90.43% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
receiver/syslogreceiver/syslog.go	100.00% <100.00%> (ø)
receiver/carbonreceiver/transport/tcp_server.go	66.00% <0.00%> (-1.00%)	⬇️
processor/groupbytraceprocessor/event.go	96.77% <0.00%> (+0.80%)	⬆️
...eiver/awsxrayreceiver/internal/udppoller/poller.go	100.00% <0.00%> (+2.32%)	⬆️
receiver/k8sclusterreceiver/watcher.go	97.64% <0.00%> (+2.35%)	⬆️

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[djaglowski]

@wph95 The latest release of opentelemetry-log-collection will require some minor changes to this code.

On this PR, I think we only need to change the docs from labels to attributes.

[wph95]

@wph95 The latest release of opentelemetry-log-collection will require some minor changes to this code.

On this PR, I think we only need to change the docs from labels to attributes.

changed docs, from labels to attributes. and clean the code.
You could re-review it :)

[djaglowski]

This looks great. Thanks @wph95!

[djaglowski]

Thanks for the contribution @wph95. I believe this is ready to go.

[bogdandrutu]

/cc @tigrannajaryan

[tigrannajaryan]

Thank you @wph95 !