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Log when filtering records
Consider logging default value

Set default values for params

config_param :log_level_label, :string, :default => 'logging-level'
config_param :log_level_key, :string, :default => 'level'
config_param :default_logging_level, :string, :default => nil

This configuration should assign default values when the plugin is not assigned values.

Null reference when log record does not contain log_level

When the log record does not contains the expected log_level key, an exception is thrown:

2018-12-10 06:38:03 +0000 [warn]: #0 send an error event to @ERROR: error_class=NoMethodError error="undefined method `downcase' for nil:NilClass" location="/opt/td-agent/embedded/lib/ruby/gems/2.1.0/gems/fluent-plugin-kubernetes-log-level-0.2.0/lib/fluent/plugin/filter_kubernetes_log_level.rb:33:in `level_to_num'" tag="<>.log" time=2018-12-10 06:38:02.810530581 +0000
2018-12-10 06:38:02.810530581 +0000 <>.log: {"log":"\n","stream":"stdout","time":"2018-12-10T06:38:02.810530581Z","docker":{"container_id":"d1946ab4a7234a790fc19e6869c7564af79f64add99bef3121b03b0dff0c9a47"},"kubernetes":{"container_name":"<>","namespace_name":"<>","pod_name":"<>","pod_id":"6dca4421-fc45-11e8-a0b5-000d3a596a78","labels":{"app":"<>","logging-level":"debug","logging-level-key":"Level","pod-template-hash":"3870667959","release":"<>"},"host":"<>","master_url":"<>","namespace_id":"e3aa7d6b-fba8-11e8-b28a-000d3a5964d7"},"level":"no_level"}

Plugin version - 0.2.0.
Look like the changes in 0.2.1 solved this issue - level.is_a return 0 for nil objects.