Slicehost & scout
We used scout to monitor our Rails applications and their fragments on slicehost. It works very well and is very, very easy to install. The key features for me are (reasonably) a wide range of monitoring agents and low cost.
Scout and NewRelic
ChrisH, NewRelic , Scout .
NewRelic , Scout, .
NewRelic , - , Scout. , , Slicehost , .
Scout , ($ 15 v $40), , .
Scout, , - api, , , memcache.
, Scout, , . , New Relic , .