As you can see, suddenly the web_external response time spiked and remained high since (this is from ~20 hours ago).
Digging in new relic shows curl_multi_exec as the source of the issue. curl_multi_exec is used by the AWS API but I dont see any difference between the previous condition and current one. and cant find an explanation for this. The throughput didn't change from previous days.
How can I further debug to find the problem ?
The system is PHP Version 5.3.10-1ubuntu3.21 on EC2