Can we silence the backtrace in RoutingError exceptions?

[RyanTG]

Since switching to Semantic Logger a couple months ago, our logs are nice! But they're noisier for RoutingErrors debug logs. It's basically a big list of gems that we don't care about logging in production logs. Example below.

Goal: I want to see that a routingerror occurred (and what that route is). But I do not want to see my list of beautiful gems.

I have tried:

filter: Proc.new { |log| log.name !="ActionController::RoutingError" }

and

Rails.backtrace_cleaner.add_silencer {|line| line.match?(/\/app\/vendor\/bundle/)}

Neither of those have produced any change here.

My config is here:

  config.log_level = ENV.fetch("RAILS_LOG_LEVEL", "info")

  config.rails_semantic_logger.add_file_appender = false
  config.rails_semantic_logger.format = :color
  config.semantic_logger.add_appender(
    io: STDOUT,
    level: config.log_level,
    formatter: config.rails_semantic_logger.format,
  )

log example:

│2024-08-26 17:05:02.034551 F [426656:puma srv tp 005 thread_local_var.rb:93] [8958f635-ec50-47c0-bf00-264d5759c176] [xx.xxx.xxx.xx] [MobileSafari/8618.2.12.10.9 CFNetwork/1496.0.7 Darwin/│
23.5.0] Rails -- Exception: ActionController::RoutingError: No route matches [GET] "/apple-touch-icon-120x120.png"
| /app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'                                                                     
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/show_exceptions.rb:29:in `call'                                                                       
│/app/vendor/bundle/ruby/3.3.0/gems/rails_semantic_logger-4.17.0/lib/rails_semantic_logger/rack/logger.rb:45:in `call_app'                                                                  
│/app/vendor/bundle/ruby/3.3.0/gems/rails_semantic_logger-4.17.0/lib/rails_semantic_logger/rack/logger.rb:26:in `block in call'                                                             │
│/app/vendor/bundle/ruby/3.3.0/gems/semantic_logger-4.16.0/lib/semantic_logger/base.rb:190:in `block in tagged'                                                                             
│/app/vendor/bundle/ruby/3.3.0/gems/semantic_logger-4.16.0/lib/semantic_logger/semantic_logger.rb:356:in `tagged'                                                                           
│/app/vendor/bundle/ruby/3.3.0/gems/semantic_logger-4.16.0/lib/semantic_logger/base.rb:202:in `tagged'                                                                                      
│/app/vendor/bundle/ruby/3.3.0/gems/rails_semantic_logger-4.17.0/lib/rails_semantic_logger/rack/logger.rb:26:in `call'                                                                      
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/remote_ip.rb:93:in `call'                                                                             
│/app/vendor/bundle/ruby/3.3.0/gems/request_store-1.6.0/lib/request_store/middleware.rb:19:in `call'                                                                                        
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/request_id.rb:26:in `call'                                                                            
│/app/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/method_override.rb:24:in `call'                                                                                                     
│/app/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/runtime.rb:22:in `call'                                                                                                             
│/app/vendor/bundle/ruby/3.3.0/gems/activesupport-7.0.8.4/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'                                                          │
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/executor.rb:14:in `call'                                                                              
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/static.rb:23:in `call'                                                                                
│/app/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/sendfile.rb:110:in `call'                                                                                                           
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/ssl.rb:77:in `call'                                                                                   
│/app/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.4/lib/action_dispatch/middleware/host_authorization.rb:131:in `call'                                                                   
│/app/vendor/bundle/ruby/3.3.0/gems/scout_apm-5.3.8/lib/scout_apm/instruments/middleware_summary.rb:58:in `call'                                                                            
│/app/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.4/lib/rails/engine.rb:530:in `call'                                                                                                      
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/configuration.rb:272:in `call'                                                                                                      
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/request.rb:100:in `block in handle_request'                                                                                         
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/thread_pool.rb:378:in `with_force_shutdown'                                                                                         
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/request.rb:99:in `handle_request'                                                                                                   
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/server.rb:464:in `process_client'                                                                                                   
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/server.rb:245:in `block in run'                                                                                                     
│/app/vendor/bundle/ruby/3.3.0/gems/puma-6.4.2/lib/puma/thread_pool.rb:155:in `block in spawn_thread'  ```

[RyanTG]

I also tried config.rails_semantic_logger.quiet_assets = true and that did not fix this issue.

[reidmorrison]

Filtering is the right way to filter out any messages to a particular appender. Keep in mind though that is appender specific, so other appenders like stdout will not get the filter, unless configured to do so.

Recommend trying it from a rails console, or adding binding.irb in the code somewhere, and interrogating the list of active appenders to verify their configuration. SemanticLogger.appenders. The filter docs: https://logger.rocketjob.io/filtering.html