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Diffstat (limited to 'activesupport/lib/active_support')
| -rw-r--r-- | activesupport/lib/active_support/notifications.rb | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/notifications.rb b/activesupport/lib/active_support/notifications.rb index f549d2fff3..13f675c654 100644 --- a/activesupport/lib/active_support/notifications.rb +++ b/activesupport/lib/active_support/notifications.rb @@ -68,6 +68,10 @@ module ActiveSupport # Sometimes you do not want to subscribe to an event for the entire life of # the application. There are two ways to unsubscribe. # + # WARNING: The instrumentation framework is designed for long-running subscribers, + # use this feature sparingly because it wipes some internal caches and that has + # a negative impact on performance. + # # === Subscribe While a Block Runs # # You can subscribe to some event temporarily while some block runs. For |