I've got a Python/Django app hosted on Heroku, monitored on New Relic, with logging tracked on Logentries. I've noticed a large amount of logs that are of the form:
at=info
method=HEAD
path="/"
host=mysite.com
fwd="xxx.xx.xxx.xx/ec2-xxx-xx-xxx-xx.compute-1.amazonaws.com"
If I look at a span of 10 minutes, I have 50 pings. 5 per minute that occur at regular intervals of exactly 60 seconds.
There are 5 individual fwd addresses that ping once every minute.
One of them is new relic because the fwd address ends with "nr-ops.net" and I have NR set up for availability monitoring.
The other 4 IPs direct to either AWS machines or Digital Ocean machines.
So I'm comfortable with the New Relic checks, but who are the other guys? I have two web dynos and a celery server set up on my app, so are those three servers pinging each other? Maybe a third is my CloudAMQP server?
Should I be concerned at all about this? I don't believe the HEAD requests are counted towards my throughput monitoring, but could this affect request queueing and performance?
Thanks!