Documentation: enable environment variable in configuration #3385
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Environment variable in configuration works only if promtail is started with `-config.expand-env=true` option. Should we add `Note: This feature is only available in Loki 2.1+.` too?
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What this PR does / why we need it:
Add in promtail documentation that environment variable in configuration works only if promtail is started with
-config.expand-env=trueoption.Which issue(s) this PR fixes:
Fix #3023
Special notes for your reviewer:
Should we add
Note: This feature is only available in Loki 2.1+.too, as in Grafana documentation?Sorry if this PR miss something, it's my first PR to an open source documentation.
Checklist