docs: backport canary updates 3.6 - #21329
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paul1r
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Mar 30, 2026
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What this PR does / why we need it:
Manual backport of #21218 to the 3.6 branch.
Special notes for your reviewer:
The 3.6 branch shows a couple of additional changes (lines 326 and 352). I checked the history and 3.6 released Nov. 17, but those two news config options were introduced in #17008 on Dec 30. Not sure if I should pull them out or not if they're not in the 3.6 branch until 3.6.4?[REMOVED]Note
Low Risk
Low risk: documentation-only changes, primarily clarifying deployment and scraping configuration without modifying runtime behavior.
Overview
Updates the Loki Canary operations doc to reflect that the canary writes logs to standard output (requiring capture to a file) and replaces older Promtail/pipeline guidance with Grafana Alloy references (including
loki.process).Refreshes the Docker pull example to a newer image tag and adds a new monolithic mode setup walkthrough with systemd output redirection plus Alloy/Prometheus snippets for scraping logs and metrics.
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