Review of SeaLion powered by the Slant community.
SeaLion is a cloud based Linux server monitoring tool. It's easy to install and easier to operate. The dashboard gives a bird's eye view of all the servers. The UI is clean and simple. It's power features include the ability for user to add his own commands, get custom alerts for metrics and receive a daily digest with the summary of the server's behavior.
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Pros
Pro Free tier
SeaLion offers a free tier that's limited to 2 servers and retains data for 3 days.