Loki Logstash Plugin #1822

adityacs · 2020-03-19T12:47:47Z

What this PR does / why we need it:
Logstash plugin for Loki

Which issue(s) this PR fixes:
Fixes #1192

Checklist

Documentation added
Tests updated

adityacs · 2020-03-19T12:48:26Z

@cyriltovena @slim-bean Need your thoughts and guidance on this

cyriltovena · 2020-03-19T14:13:14Z

Can you remove the .class and .gem files, basically all artefacts. Feel free to add an .gitignore for that folter.

logstash/build.gradle

logstash/logstash-output-java_output_example.gemspec

cyriltovena · 2020-03-19T14:28:34Z

Have you considered writing the plugin only in ruby ? I think it would make our life easier since we also have a ruby plugin for fluentd.

adityacs · 2020-03-19T14:39:42Z

@cyriltovena Ruby is new to me. It would take little more time for me to write the plugin in Ruby. I totally agree that it would be lot easier to maintain the code since we already have fluentd in Ruby.

What do you think? If you say let's stick to Ruby, let's go with Ruby. I will close this and create new PR.

slim-bean · 2020-03-19T15:01:17Z

Hey @adityacs, firstly can't thank you enough for all your contributions lately. You are a pleasure to work with and we really appreciate everything you are doing!!

I think in this case Ruby would be preferred as adding the java toolchain I think is adding another amount of complication we may not want. It looks like most other logstash plugins are ruby based.

adityacs · 2020-03-19T15:06:44Z

@slim-bean Yeah Ruby would be better. I just took an easy route since I am familiar with Java 😜

I will work on the Ruby plugin and update this PR.

cyriltovena · 2020-03-19T15:08:37Z

I'm not the best but I've been involved a lot lately with the fluentd plugin in Ruby, so don't hesitate to ask question on #loki-dev by pinging me or @slim-bean.

adityacs · 2020-03-19T15:10:23Z

Sure @cyriltovena

adityacs · 2020-03-19T15:11:37Z

@slim-bean @cyriltovena Thanks for the feedback. It's a great experience to work with you guys.
Thanks again for all the guidance.

adityacs · 2020-03-26T14:12:26Z

Pushed plugin with Ruby code. Have to add add few tests.

adityacs · 2020-03-27T13:25:07Z

@cyriltovena @slim-bean Have added tests and also updated the docs. Kindly requesting you guys to review this

Also, let me know if you are able to build and test the plugin.

codecov-io · 2020-03-27T13:35:34Z

Codecov Report

Merging #1822 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1822      +/-   ##
==========================================
- Coverage   64.75%   64.72%   -0.03%     
==========================================
  Files         122      122              
  Lines        9271     9271              
==========================================
- Hits         6003     6001       -2     
- Misses       2853     2854       +1     
- Partials      415      416       +1

Impacted Files	Coverage Δ
pkg/promtail/targets/tailer.go	`76.13% <0.00%> (-2.28%)`	⬇️

cyriltovena · 2020-03-30T15:10:29Z

logstash/LICENSE

@@ -0,0 +1,202 @@
+


@slim-bean do we need to have a license ?

No separate license, this would fall under the license for the project itself

Will remove

cyriltovena · 2020-03-30T15:12:21Z

Can you remove binary artifacts. Feel free to add a .gitignore to this new folder if required.

cyriltovena · 2020-03-30T22:23:01Z

logstash/lib/logstash/outputs/loki.rb

+    data_labels = lbls.merge(@external_labels)
+
+    entry_hash = {
+      "ts" => event.get("@timestamp").to_i * (10**9) +  Time.new.nsec,


What's going on here ?

This converts the timestamp to nano seconds

I have doubts about the new here, may be a test since we know what timestamp are using logstash ;)

logstash/lib/logstash/outputs/loki.rb

cyriltovena · 2020-03-31T01:19:05Z

logstash/lib/logstash/outputs/loki.rb

+      "line" => event.get("message").to_s
+    }
+
+    @Channel.go do


I don’t think you need a go here ?

Not required. Will remove

Actually Channel.go is required here. Since we are using unbuffered channel(i.e without specifying capacity), if we don't use Channel.go it hangs there without proceeding with the code

Hanging is fine, if it is hanging it is probably waiting for the previous batch to be sent.

If you keep it this way, it means for each event, (million of them) create a go routine. That can be huge for the system.

You may want to use buffered but I think it's better to wait, this also signal, don't send more we're busy to the plugin.

Yeah, got your point. Will make the change

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adityacs · 2020-07-14T03:49:24Z

cmd/logstash/README.md

+git clone git@github.com:elastic/logstash.git
+cd logstash
+git checkout tags/v7.6.2
+export LOGSTASH_PATH=`pwd`


adityacs · 2020-07-14T06:55:13Z

We are pending with Makefile changes to build this plugin. I will take care of this

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adityacs · 2020-07-15T03:15:13Z

cmd/logstash/lib/logstash/outputs/loki/entry.rb

+            event.to_hash.each { |key,value|
+                next if key.start_with?('@')
+                next if value.is_a?(Hash)


We should consider the nested fields as well right? Any reason to skip it?

They can already create new field out of current field if they want to.

I think logstash is good enough for managing fields that we shouldn't try to do anything.

Now testing/writing docs and charts. Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

cyriltovena · 2020-07-15T20:34:21Z

One sec I've just finished the code.

…loki_logstash_plugin Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

cmd/logstash/lib/logstash/outputs/loki.rb

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adityacs mentioned this pull request Mar 19, 2020

Logstash plugin #1192

Closed

adityacs force-pushed the loki_logstash_plugin branch from 499a68a to c19554b Compare March 19, 2020 12:53

cyriltovena reviewed Mar 19, 2020

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adityacs force-pushed the loki_logstash_plugin branch 2 times, most recently from 4754a74 to 9b1d683 Compare March 26, 2020 14:07

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pull-request-size bot added size/XL and removed size/L labels Jul 13, 2020

Rename without Grafana

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Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adityacs commented Jul 14, 2020

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A lot of refactoring and testing.

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Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adityacs commented Jul 15, 2020

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adityacs and others added 2 commits July 15, 2020 16:49

change delay logic

d10f042

Fully tested version.

26875cb

Now testing/writing docs and charts. Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

Merge branch 'loki_logstash_plugin' of github.com:adityacs/loki into …

5a1af98

…loki_logstash_plugin Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

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cyriltovena added 4 commits July 15, 2020 16:36

Forgot to save merge.

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Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

working version.

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Makefile + easier docker build.

4776178

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

adds ci to build logstash image.

425d375

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

pull-request-size bot added size/XXL and removed size/XL labels Jul 16, 2020

cyriltovena added 9 commits July 16, 2020 11:05

Fix build for logstash.

0d2acee

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

Adds example with helm charts.

37508d1

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

Fix target to send 10 logs with logstash.

a8cde47

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Improved documentation.

0a266ec

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add missing helm add repo for external repo

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Review comment.

c87581a

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Fixes loki service in Promtail.

3e6a5cf

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

Merge remote-tracking branch 'upstream/master' into loki_logstash_plugin

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Update loki-stack version

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Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

cyriltovena approved these changes Jul 17, 2020

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cyriltovena merged commit 4c60907 into grafana:master Jul 17, 2020

steven-sheehy mentioned this pull request Jul 23, 2020

Helm: Fix regression in chart name #2406

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Loki Logstash Plugin #1822

Loki Logstash Plugin #1822

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Loki Logstash Plugin #1822

Loki Logstash Plugin #1822

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