Monitoring is what allows you to generate complete transparency of the online service that you’re responsible for, including cloud infrastructure, application functionality and SLA. Modern IT monitoring seems to be composed of two layers: an infrastructure layer and an application layer. On the infrastructure layer, VMs, network, and storage are monitored, revealing memory consumption, CPU utilization, and network connection metrics. On the application layer, database performance, browsing latency, and actual application functionalities, such as users registration, login and cart are monitored. For mega sites like eBay and PayPal, even the slightest latency can lead to a loss of millions of dollars. If your online service isn’t monitored closely, the trust and confidence of your users can be significantly compromised. In this post, I would like to touch on several points that describe the current state of the market, how essential it is to monitor your resources, and what monitoring is built on.