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Monitoring can cover many things that an application needs to function, like network connectivity, Domain Name System records, database connectivity, bandwidth, and computer resources like free RAM, CPU load, disk space, events, etc. Commonly measured metrics are response time and availability (or uptime), but consistency and reliability ...
Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.
Uptime is a measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available. Uptime is the opposite of downtime . Htop adds an exclamation mark when uptime is longer than 100 days.
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“Cold” standby systems are offline until the active fails and typically restart from a “baseline” state. For example, many cloud solutions will restart a virtual machine on another physical machine if the underlying physical machine fails. “Cold” fail over standby latency can range from 30+ seconds to several minutes.
ZABBIX: State-of-the-art network monitoring Linux.com; Ramm, Mark (March 15, 2005). The Watcher Knows, Linux Magazine; Schroder, Carla (May 24, 2005). Monitor Your Net with Free, High-Performance ZABBIX, Enterprise Networking Planet; Wallen, Jack (March 8, 2022). Network monitoring tools every admin should know Tech Republic
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Active monitoring, on the other hand, consists of synthetic probes and web robots predefined to report system availability and business transactions. Active monitoring is a good complement to passive monitoring; together, these two components help provide visibility into application health during off-peak hours when transaction volume is low.
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