Useful to silence noisy logs from gems that your application may not care about, without needing to change the log level and losing other useful logs.

Allow ActiveSupport::ProxyLogger to ignore messages by pattern by federico-carrocera · Pull Request #58328 · rails/rails · GitHub

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Allow ActiveSupport::ProxyLogger to ignore messages by pattern - #58328

#58328

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byroot merged 1 commit into

rails:mainrails/rails:mainfrom

federico-carrocera:fede/proxy-logger-ignore-patternsfederico-carrocera/rails:fede/proxy-logger-ignore-patternsCopy head branch name to clipboard

Aug 10, 2026

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Allow ActiveSupport::ProxyLogger to ignore messages by pattern#58328

byroot merged 1 commit into

rails:mainrails/rails:mainfrom

federico-carrocera:fede/proxy-logger-ignore-patternsfederico-carrocera/rails:fede/proxy-logger-ignore-patternsCopy head branch name to clipboard

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federico-carrocera commented Jul 31, 2026

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ProxyLogger can only filter by severity, so silencing one noisy message from a gem means raising the level and losing every message below it.

SomeLibrary.logger = ActiveSupport::ProxyLogger.new(Rails.logger).ignore(/Noisy/)

Regexps are matched against the message, strings are matched literally. Patterns are compiled into a single Regexp.union at registration time, and matching only happens after the severity check, so proxies without patterns are unaffected.

add now takes Logger#add’s explicit signature rather than forwarding ..., because the message has to be resolved before it can be matched.

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All reactions github-actions Bot added the activesupport label Jul 31, 2026

[Allow ActiveSupport::ProxyLogger to ignore messages by pattern](/rails/rails/pull/58328/commits/299defb0c79aff183da78196aa65e3d05c92d331 "Allow ActiveSupport::ProxyLogger to ignore messages by pattern ProxyLogger can only filter by severity, so silencing one noisy message from a gem means raising the level and losing every message below it. SomeLibrary.logger = ActiveSupport::ProxyLogger.new(Rails.logger) .ignore(/Noisy/) Regexps are matched against the message, strings are matched literally. Patterns are compiled into a single Regexp.union at registration time, and matching only happens after the severity check, so proxies without patterns are unaffected. add now takes Logger#add's explicit signature rather than forwarding `...`, because the message has to be resolved before it can be matched.") …

[299defb](/rails/rails/pull/58328/commits/299defb0c79aff183da78196aa65e3d05c92d331)

ProxyLogger can only filter by severity, so silencing one noisy message from a gem means raising the level and losing every message below it.

SomeLibrary.logger = ActiveSupport::ProxyLogger.new(Rails.logger)
  .ignore(/Noisy/)

Regexps are matched against the message, strings are matched literally. Patterns are compiled into a single Regexp.union at registration time, and matching only happens after the severity check, so proxies without patterns are unaffected.

add now takes Logger#add’s explicit signature rather than forwarding `…`, because the message has to be resolved before it can be matched.

byroot force-pushed the fede/proxy-logger-ignore-patterns branch from f0b28f6 to 299defb Compare August 10, 2026 06:41

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byroot merged commit 46347d1 into rails:main Aug 10, 2026

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