The values of each storage device are rolled up into a single value that represents the total storage space of the server:Īlert policies are also interpreted in total disk space. This value takes into account the Droplet’s root storage and any additional attached block storage devices. This is expressed as a percentage of the total disk space available on the server. Disk Usageĭisk usage is a measurement of how much disk space is currently being used. Separate alert policies can be created to monitor disk read operations and disk write operations. Droplet graphs show these as two separate lines within the Disk I/O graph: This is expressed in MB/s, or megabytes per second.ĭigitalOcean breaks disk I/O down into read and write operations, which are handled separately. Disk I/Oĭisk I/O, or input/output, is a measure of how much read and write activity the server’s disks are experiencing. Other utilities like htop and top, however, may include cache as used memory.
#Monit digitalocean free
On DigitalOcean, used memory is calculated by subtracting free memory and memory used for caching from the total memory amount. Because cache memory is temporarily on loan, DigitalOcean does not report memory used for caching as used memory. Linux borrows unused memory for disk caching to optimize performance, but this memory can be given back immediately if needed by a process. This is expressed as a percentage of the total available physical memory:ĭigitalOcean calculates memory consumption by evaluating memory information exposed in /proc/meminfo. Memory utilization is a measurement of the memory being consumed on the server. Occasional spikes in the 1- and 5-minute load averages above the number of vCPUs are typically acceptable. On a 4 vCPU Droplet, that same load average would equate to 50% of maximum load on average, 2 processors are each busy with one process, and 2 are free.Īs general rule, if the 15-minute load average is trending above the number of vCPUs, we recommend looking into it right away.
On a single vCPU Droplet, a load average of 2.0 means that the processor is operating over capacity, with 1 process using vCPU and 1 waiting on average. Load averages do not take the number of cores, or Droplet vCPUs, into consideration. The metrics agent collects information for 1-, 5-, and 15-minute load averages, which come from /proc/loadavg. In other words, more recent data points are more impactful in the average calculation. An exponentially weighted moving average means that older data points are given exponentially less weight in the average calculation.
#Monit digitalocean plus
Load average is a measure of processor load, expressed as the exponentially weighted moving average of processes that are using CPU plus those waiting for CPU time. For example, other tools might express metrics out of 200% on a machine with two CPUs, or 400% for a quad-core processor. This differs from some CPU usage tools which report 100% per CPU or core. On DigitalOcean, total use of all processors combined is indicated by 100%. Alert policies do not distinguish between user and system time.
System time is time spent executing kernel-level instructions, while user time is time spent executing userland instructions, which is defined by anything outside of the kernel. In the Droplet graphs, CPU usage is broken down based on Linux’s conception of system and user time. CPU utilization is expressed as a percentage. CPU UtilizationĬPU utilization measures the amount of processor being used at a given time. Metrics can either refer to the resource and unit with which to measure, or the data that is collected about that resource. In computing, a metric is a standard for measuring a computer resource.
This glossary covers the different system resources tracked, the units used to measure them, and how they are represented by DigitalOcean Monitoring. It provides additional Droplet graphs and supports configurable metrics alert policies with integrated email Slack notifications to help you track the operational health of your infrastructure.ĭigitalOcean Monitoring uses a variety of metrics to track system health. DigitalOcean Monitoring is a free, opt-in service that gathers metrics about Droplet-level resource utilization.
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