Adjust the sensitivity of anomaly detection for infrastructure
Dynatrace detects multiple infrastructure-related performance anomalies that might lead to problems with your infrastructure (the particular list depends on the type of your infrastructure). Each anomaly type is detected independently and triggers its own problems and alerts.
To adjust global configuration of anomaly detection for infrastructure
- In the Dynatrace menu, go to Setting and select Anomaly detection > Infrastructure.
- Select the tab for the required infrastructure type. From here you can configure detection for each anomaly type.
Anomaly detection can be configured for all hosts monitored by Dynatrace regardless of their type (physical or virtual). Dynatrace also detects network and disk problems of your hosts.
For each anomaly type, you can either select automatic detection to rely on Davis to alert you about problems, or you can provide a fixed threshold. Just select the required option from the respective list.
By default, Dynatrace alerts only about unexpected outages.
- During a graceful shutdown, the host outage is expected and the operating system has sent a shutdown signal notifying OneAgent that an operator is intentionally shutting down the host.
- If OneAgent receives no shutdown signal, the shutdown is classified as unexpected.
You can opt-in to receive notifications about graceful shutdowns as well.
Thresholds for a specific host
As an alternative to defining thresholds globally across your entire environment, you can provide fine-tuned thresholds for individual hosts. Host-level thresholds override global thresholds for the host, while global settings still apply to other hosts. You can revert to globally defined thresholds at any time.
To change threshold settings for a specific host
- In the Dynatrace menu, go to Hosts.
- Select the host you want to configure.
- In the browse menu (…), select Settings.
- Select Anomaly detection.
- Turn off Use host group anomaly detection.
- Adjust the host-level thresholds in the same manner as for global settings.
Thresholds for specific disks
Davis automatically detects disk anomalies such as low available disk size or slow disks. There are different kinds of disks on a host, such as a boot disk, a disk holding all the logs, or a disk for storing business data. While alerting on low disk space would not make any sense for a fixed sized boot disk image, it makes perfectly sense for a disk containing critical business data.
With custom disk detection rules, you can provide fine-tuned rules for individual groups (groups are based on disk name patterns and/or host tags) of disks. Disk-level thresholds override global thresholds for matching disks, while global settings still apply to other disks.
To change threshold settings for a group of disks
- In the Dynatrace menu, go to Settings and select Anomaly detection > Infrastructure.
- Scroll down to the Custom disk-detection rule section and select Add monitoring rule.
- Select the metric to be monitored and provide a meaningful name for the rule.
- Specify the threshold for the metric and the number of samples that must violate the threshold to trigger an alert.
- Specify the name pattern of the disk.
- optional To further narrow down the disk usage, list the tags that the host must have.
- optional To further narrow down the disk usage, select the host group to which the host must belong.
- Select Save.