Beats: Logging: Log attempts from Beats to re-establish connections

[ppf2]

Currently, at the default logging level, we are not logging entries on when Logstash attempts to re-establish connections (eg. due to DNS for downstream servers not available). For example, after these messages when the DNS issue is resolved:

2017-09-07T02:50:43-07:00 WARN DNS lookup failure "<hostname>": lookup <hostname> on <ip>: read udp <ip>:51430-><ip>: i/o timeout
2017-09-07T02:50:43-07:00 ERR Connect failed with: lookup <hostname> on <ip>: read udp <ip>:51430-><ip>: i/o timeout

Having this information logger at the default level can help with troubleshooting.

[liketic]

Hi @ppf2 seems like it's a low hanging fruit issue, can I take it? 😄

[ruflin]

@liketic Of course, all contributions are welcome.

[brandonmensing]

@liketic https://github.com/elastic/beats/issues/5198 may be tempting for you as well, and thanks for any contribution here!

[recrsn]

Hi, I'm currently looking at beats source code and getting familiar with it. I'm interested to give this a try.