Fluentd stalls on unexpected error Net::OpenTimeout

[ewindisch]

The following error can occur, stalling fluentd processing and (apparently) requiring a restart.

2016-07-28 14:54:59 +0000 [error]: unexpected error error="Net::OpenTimeout"
  2016-07-28 14:54:59 +0000 [error]: /usr/local/lib/ruby/2.3.0/net/http.rb:930:in `connect'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/lib/ruby/2.3.0/net/http.rb:863:in `do_start'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/lib/ruby/2.3.0/net/http.rb:852:in `start'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/lib/ruby/2.3.0/net/http.rb:1398:in `request'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/faraday-0.9.2/lib/faraday/adapter/net_http.rb:82:in `perform_request'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/faraday-0.9.2/lib/faraday/adapter/net_http.rb:40:in `block in call'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/faraday-0.9.2/lib/faraday/adapter/net_http.rb:87:in `with_net_http_connection'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/faraday-0.9.2/lib/faraday/adapter/net_http.rb:32:in `call'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/faraday-0.9.2/lib/faraday/response.rb:8:in `call'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/google-api-client-0.8.6/lib/google/api_client/request.rb:163:in `send'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/google-api-client-0.8.6/lib/google/api_client.rb:648:in `block (2 levels) in execute!'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/retriable-1.4.1/lib/retriable/retry.rb:27:in `perform'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/retriable-1.4.1/lib/retriable.rb:15:in `retriable'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/google-api-client-0.8.6/lib/google/api_client.rb:645:in `block in execute!'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/retriable-1.4.1/lib/retriable/retry.rb:27:in `perform'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/retriable-1.4.1/lib/retriable.rb:15:in `retriable'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/google-api-client-0.8.6/lib/google/api_client.rb:636:in `execute!'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/google-api-client-0.8.6/lib/google/api_client.rb:679:in `execute'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/gcloud-0.6.3/lib/gcloud/pubsub/connection.rb:220:in `pull'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/gcloud-0.6.3/lib/gcloud/pubsub/subscription.rb:254:in `pull'
  2016-07-28 14:54:59 +0000 [error]: /usr/local/bundle/gems/fluent-plugin-gcloud-pubsub-0.0.5/lib/fluent/plugin/in_gcloud_pubsub.rb:65:in `subscribe'

[ewindisch]

/cc @pselle