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Static thresholds

Dynatrace infrastructure monitoring is based on numerous built-in, predefined static thresholds. These thresholds relate to resource contentions like CPU spikes, memory, and disk usage. You can change these default thresholds by going to Settings > Anomaly Detection > Infrastructure in the Dynatrace menu.

For applications and services, you can disable automated baselining-based reference-value detection anytime and switch to user-defined static thresholds. If you set a static threshold for response time and error rate on an application or service level, events will be raised if the static threshold is breached. A slowdown event is raised if the static thresholds for either the median or the 90th percentile response times are breached.

Predefined static thresholds for hosts

HostsDefault static threshold

CPU saturation

  • Alert if CPU usage is higher than 95% in 3 of 5 one-minute intervals.

Memory event usage

  • Alert if memory usage is higher than 90% on Windows or 80% on Linux
  • AND memory page fault rate is higher than 100 faults/s on Windows or 20 faults/s on Linux in 3 of 5 one-minute intervals.

GC activity

  • Alert if GC time is higher than 40%
  • OR GC suspension is higher than 25% in 3 of 5 one-minute intervals.

Java out of memory

  • Alert if the number of Java out-of-memory exceptions is 1 per minute or higher.

Predefined static thresholds for networks

NetworkDefault static threshold

Number of dropped packets

  • Alert if receive/transmit dropped packet percentage is higher than 10%
  • AND total packets rate is higher than 10 packets/s in 3 of 5 one-minute intervals.

Network utilization

  • Alert if sent/received traffic utilization is higher than 90% in 3 of 5 one-minute intervals.

TCP connectivity for process

  • Alert if percentage of new connection failures is higher than 3%
  • AND number of failed connections is higher than 10 connections/min in 3 of 5 one-minute intervals.

Retransmission rate

  • Alert if retransmission rate is higher than 10%
  • AND number of retransmitted packets is higher than 10 packets/min in 3 of 5 one-minute intervals.

Predefined static thresholds for disks

DiskDefault static threshold

Low disk space

  • Alert if free disk space is lower than 3% in 3 of 5 one-minute intervals.

Slow running disks

  • Alert if disk read time or write time is higher than 200 ms in 3 of 5 one-minute intervals.

Inodes number available

  • Alert if percent of available inodes is lower than 5% in 3 of 5 one-minute intervals.

As static thresholds don't adapt to changing environments and require too much manual effort, Dynatrace also offers intelligent, automated multi-dimensional baselining, which works out of the box, without manual configuration of thresholds. Most importantly, it adapts automatically to changes in traffic patterns.