Nagios Alternatives
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worker
PHP worker process that writes all event data to a storage backend
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netdata
Real-time performance monitoring, done right! https://www.netdata.cloud
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Scout
Get performance insights in less than 4 minutes. Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
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GoAccess
GoAccess is a real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through your browser.
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progress
Linux tool to show progress for cp, mv, dd, ... (formerly known as cv)
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processhacker
A free, powerful, multi-purpose tool that helps you monitor system resources, debug software and detect malware.
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nvtop
NVIDIA GPUs htop like monitoring tool
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nginx-module-vts
Nginx virtual host traffic status module
Posts
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Nagios Inconsistencies
As far as i know there is no option to log all executed service checks except the debug log. Probably you are looking for log_service_retries=1 ?
Stats
NagiosEnterprises/nagioscore is an open source project licensed under GNU General Public License v3.0 only which is an OSI approved license.