docs: add warning around using logstash plugin for new deployments (backport release-3.3.x) #15138
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Backport 716d54e from #14058
What this PR does / why we need it:
Over the years we have really grown to loathe the logstash plugin for the reasons described in the text of this PR. We aren't deprecating or removing it yet but really want to discourage its use for any new deployments.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Checklist
CONTRIBUTING.md
guide (required)feat
PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.docs/sources/setup/upgrade/_index.md
production/helm/loki/Chart.yaml
and updateproduction/helm/loki/CHANGELOG.md
andproduction/helm/loki/README.md
. Example PRdeprecated-config.yaml
anddeleted-config.yaml
files respectively in thetools/deprecated-config-checker
directory. Example PR