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flush_trace

experimental module to add backtrace debug to cache_clear and Twig invalidate

Installation

  • Download into your custom modules directory and enable the module "Flush trace (flush_trace)"
  • drush en flush_trace

What it does

  • Whenever cache is cleared, hook_cache_flush() is called. This module adds a log message "Cache flush triggered" along with a backtrace of which item invoked the cache flush.
  • Whenever \Drupal::service('twig')->invalidate() is called, we decorate the TwigEnvironment service and add a log message "Twig invalidate triggered" along with a backtrace of which item invoked the invalidation.

Caveats

  • To avoid out of memory (OOM) errors from a deep backtrace, we limit the depth of the backtrace to 10 by default. The backtrace depth is configurable at /admin/config/development/logging/flush_trace, where you can increase backtrace depth up to a max of 50.