Host monitoring with Dynatrace

We have redesigned the host overview page.

This documentation describes the new design.
If you want to revert to the classic host page, turn on Switch back to the classic page in the Welcome to the new page! message on the new host page and then refer to the documentation for the classic host page.

As soon as data about hosts is collected, Dynatrace Davis® AI starts baselining the data instantly. Each metric displayed on the host overview page is part of Davis AI source data used for automatically identifying potential performance issues at the infrastructure or full-stack level.

How to get there:

In the Dynatrace menu, go to Hosts to list all the hosts (physical or virtual) in your environment that have OneAgent installed on them.
Select a host name in the list to go to that host's overview page.

All relevant host metrics are shown on a single page, which is divided into several logical sections.

Notifications bar

The host notifications bar gives you a quick overview of the host state. Select a notification item to display more information.

Properties and tags

Select Properties and tags on the notifications bar to display the Properties and tags panel, which displays metadata about the selected host:

Tags lists tags currently applied to the host. Select Add Tag to add a tag to the host metadata.
Properties lists various host properties, such as OneAgent version, OS version, monitoring mode, IP addresses, and management zones.

Problems

On the notifications bar, Problems indicates active and closed problems related to the selected host.
Select Problems on the notifications bar to display the Problems panel, which lists the problems.
- Select a problem to display details.
- Select Go to problems to go to the Problems page filtered by the selected host.

Vulnerabilities

On the notifications bar, Vulnerabilities indicates the top detected vulnerabilities affecting the selected host.
Select Vulnerabilities on the notifications bar to display the Vulnerabilities panel, which lists the most severe third-party vulnerabilities and code-level vulnerabilities related to this host.
- Select a vulnerability in the list to view the details and understand the severity and impact of a vulnerability within your environment.
- For a complete list of the detected vulnerabilities affecting this host, select Show all third-party vulnerabilities/Show all code-level vulnerabilities.
Example third-party vulnerabilities:

Example code-level vulnerabilities:

Note: If you're missing the security permissions for the selected management zone, the Vulnerabilities tab on the notification bar shows Not analyzed.

Availability

On the notifications bar, Availability indicates the percentage of time that the host was online and responsive to requests. Dynatrace detects and shows operating system shutdowns (including reboots) and periods when a host is offline (for example, if the host is down unexpectedly).
Select Availability on the notifications bar to display the Host availability panel, which charts host availability over time.

For details, see Host availability.

SLOs

On the notifications bar, SLOs indicates the current number of SLOs related to the selected host.
Select SLOs on the notifications bar to display the Service-level objectives panel, which lists SLOs that are directly or indirectly connected to the host.

Directly connected SLOs

An SLO is directly connected to a host when the entity selector of an SLO meets the following criteria:
- The entity type is set to "HOST".
- The entity ID is set to the host ID.
To see only SLOs that are directly connected to the host, make sure that Show only directly connected SLOs is turned on.

Indirectly connected SLOs

An SLO isn't directly connected to a host when, in the entity selector of an SLO, no entity ID is provided.

Example: When generic values, such as type("HOST"),tag("slo") are provided, the query results in all SLOs for all hosts, including the current host.
To see SLOs that are not directly connected to the host, turn off Show only directly connected SLOs.

Options

Select Details to view a chart of the respective SLO metrics.
In Actions, select
- View in Data explorer to see SLO metrics in Data explorer.
- Pin to Dashboard to pin the SLO to your dashboard.
- SLO definition to edit the SLO in Service-level objective definitions.
- Clone to clone the SLO.
- Create alert to create an alert for the SLO.

No SLOs

If no SLOs are found, you can

Select a different timeframe in the upper-right corner.
Select Add SLO to create an SLO in the SLO wizard.

Example SLO panel

Performance

Incoming connections

The Incoming connections section displays a table of hosts that are upstream from the selected host.

Select any host to go to that host's overview page.
Select > Analyze process connections to display the Process connections page, where you can view the incoming and outgoing connections.

Outgoing connections

The Outgoing connections section displays a table of hosts that are downstream from the selected host.

Select any host to go to that host's overview page.
Select > Analyze process connections to display the Process connections page, where you can view the incoming and outgoing connections.

Host performance

Go to the Host performance section for quick insights with relevant metrics: CPU, memory, and network metrics, with different metric aggregations for the selected timeframe. Timeline browsing lets you pinpoint selected anomalies in all metric charts simultaneously, making it easier to understand the relationships between the various infrastructure components at a specific point in time.

It is easy to inspect maximum or minimum peaks in resource consumption, as each metric chart allows the selection of a different aggregation. Custom metrics can also be displayed instead of the default metrics, allowing inspection of specific relationships across metrics that might be critical for any specific host configuration.

Leverage these charts

Select in the upper-right corner of a chart to:

Show in data explorer—Opens the data explorer for the associated query, so you can view the associated query, explore the data more in-depth, adjust the chart settings, and pin the chart to your own dashboard.
Pin to dashboard—Pins a copy of the selected chart to any dashboard you can edit. For example, if certain hosts are particularly important to your business, create a dashboard designated to monitoring only those hosts, and then pin charts from their host overview pages to that dashboard, all with almost no typing.

Process analysis

To get a better understanding of process behavior, go to the Process analysis section, which charts and lists processes running on the selected host. Select a process to drill down for details about that process on the host.

Leverage these charts

Select in the upper-right corner of a chart to:

Show in data explorer—Opens the data explorer for the associated query, so you can view the associated query, explore the data more in-depth, adjust the chart settings, and pin the chart to your own dashboard.
Pin to dashboard—Pins a copy of the selected chart to any dashboard you can edit. For example, if certain hosts are particularly important to your business, create a dashboard designated to monitoring only those hosts, and then pin charts from their host overview pages to that dashboard, all with almost no typing.

Process instance snapshots

OneAgent version 1.237+

The Process instance snapshots section offers additional insights into the most resource-consuming processes running on your host and the processes defined for Process availability monitoring.

A single process instance snapshot is a set of monitoring data for processes. It contains data on the process CPU usage (%), Memory usage (B), Incoming network traffic (KB), and Outgoing network traffic (KB) measured at one-minute intervals. A single snapshot contains 20 minutes of monitoring data: 10 minutes preceding the trigger and 10 minutes after the trigger. Each host can report only 60 minutes of these metrics per day. A process is considered for the snapshot if its consumption of CPU, memory, or network is more than 1%.

A process instance snapshot is triggered by high CPU, memory, or network usage on your host. You can also request a process snapshot manually. Select in the upper-right corner of the section and select Request process snapshot now. Wait for a message confirming a successful snapshot trigger. Process snapshot data should appear after you reload the page within 90 seconds.

Additionally, for processes defined for Process availability monitoring, the snapshot shows how the processes behaved before they disappeared and if they reappeared within 10 minutes.

Enable process instance snapshots

You can enable process instance snapshots at a host or environment level.

To enable it at the environment level, in the Dynatrace menu, go to Settings, select Processes and containers > Process instance snapshots, and turn on Enable process instance snapshots.
To define a host-level rule, go to a host overview page, select , go to Settings, select Process instance snapshots, and turn on Enable process instance snapshots.
To define a host group level rule, go to the host group page at https://your-environment/ui/settings/HOST_GROUP-NAME, select Process instance snapshots, and turn on Enable process instance snapshots.

On the same settings page, you can also lower the limit of processes reported in a single snapshot. The maximum/default setting is 100 processes.

Disk analysis

To identify disk performance bottlenecks, go to the Disk analysis section , which displays all mount points for Linux systems and all volumes for Windows. At a glance, you can see the disk space usage and throughput metrics, in addition to other selected disk metrics, to allow rapid identification of any disk performance issues.

On the host page, filter disks by disk name to focus on the selected disk
Expand a disk entry to see details about the selected disk. Each disk instance displays separate detailed performance metrics, making it easy to spot any disk resource not performing optimally.

Each mount point (Linux) or volume (Windows) has its own performance metrics in addition to the combined metrics. This allows spotting a slow or erratic disk much easier. Alerts can be set for individual disks as for the combined charts.

Leverage these charts

Select in the upper-right corner of a chart to:

Show in data explorer—Opens the data explorer for the associated query, so you can view the associated query, explore the data more in-depth, adjust the chart settings, and pin the chart to your own dashboard.
Pin to dashboard—Pins a copy of the selected chart to any dashboard you can edit. For example, if certain hosts are particularly important to your business, create a dashboard designated to monitoring only those hosts, and then pin charts from their host overview pages to that dashboard, all with almost no typing.

Disk monitoring

Limitations

Supported disk metrics

Supported disk metrics

Infrastructure

Disk

Metric key	Name and description	Unit	Aggregations	Monitoring consumption
builtin:host.disk.throughput.read	Disk throughput read File system read throughput in bits per second	bit/s	autoavgmaxmin	Host units
builtin:host.disk.throughput.write	Disk throughput write File system write throughput in bits per second	bit/s	autoavgmaxmin	Host units
builtin:host.disk.avail	Disk available Amount of free space available for user in file system. On Linux and AIX it is free space available for unprivileged user. It doesn't contain part of free space reserved for the root.	Byte	autoavgmaxmin	Host units
builtin:host.disk.bytesRead	Disk read bytes per second Speed of read from file system in bytes per second	Byte/second	autoavgmaxmin	Host units
builtin:host.disk.bytesWritten	Disk write bytes per second Speed of write to file system in bytes per second	Byte/second	autoavgmaxmin	Host units
builtin:host.disk.free	Disk available % Percentage of free space available for user in file system. On Linux and AIX it is % of free space available for unprivileged user. It doesn't contain part of free space reserved for the root.	Percent (%)	autoavgmaxmin	Host units
builtin:host.disk.inodesAvail	Inodes available % Percentage of free inodes available for unprivileged user in file system. Metric not available on Windows.	Percent (%)	autoavgmaxmin	Host units
builtin:host.disk.inodesTotal	Inodes total Total amount of inodes available for unprivileged user in file system. Metric not available on Windows.	Count	autoavgmaxmin	Host units
builtin:host.disk.queueLength	Disk average queue length Average number of read and write operations in disk queue	Count	autoavgmaxmin	Host units
builtin:host.disk.readOps	Disk read operations per second Number of read operations from file system per second	Per second	autoavgmaxmin	Host units
builtin:host.disk.readTime	Disk read time Average time of read from file system. It shows average disk latency during read.	Millisecond	autoavgcountmaxminsum	Host units
builtin:host.disk.used	Disk used Amount of used space in file system	Byte	autoavgmaxmin	Host units
builtin:host.disk.usedPct	Disk used % Percentage of used space in file system	Percent (%)	autoavgmaxmin	Host units
builtin:host.disk.utilTime	Disk utilization time Percent of time spent on disk I/O operations	Percent (%)	autoavgmaxmin	Host units
builtin:host.disk.writeOps	Disk write operations per second Number of write operations to file system per second	Per second	autoavgmaxmin	Host units
builtin:host.disk.writeTime	Disk write time Average time of write to file system. It shows average disk latency during write.	Millisecond	autoavgcountmaxminsum	Host units

OneAgent installer based deployment:
- Network disks are supported only for Linux hosts.
- SMB 1.0 is not supported.
OneAgent application-only deployment:
- Application-only OneAgents provide a reduced set of Disk I/O metrics, such as:
  - Disk read bytes per second
  - Disk write bytes per second
  - Disk read operations per second
  - Write operations per second
- Linux uses the file /proc/diskstats that provides information about disk I/O activity on the system. /proc/diskstats does not provide any information about network mounts.
- Solaris doesn't provide any Disk I/O information.
- AIX reports only the Disk I/O information about Disk read bytes per second and Disk write bytes per second.

Disable monitoring for specific disks

Set an exclusion filter to avoid problems with special mount points:

Go to Settings > Preferences > Disk options.
Select Add item to exclude the disk from the monitoring list.
Provide your OS, disk path and file system type.
Select Save changes.

Infrastructure

Network analysis

To spot network-related issues rapidly, go to the Network analysis section, which lists all network interfaces and combined metrics for all of them, in addition to individual metrics per network interface.

Use this section to:

Identify packet loss, error packets, and other network issues
Search for network interfaces by network name
Identify network bottlenecks down to the specific adapter

Leverage these charts

Select in the upper-right corner of a chart to:

Show in data explorer—Opens the data explorer for the associated query, so you can view the associated query, explore the data more in-depth, adjust the chart settings, and pin the chart to your own dashboard.
Pin to dashboard—Pins a copy of the selected chart to any dashboard you can edit. For example, if certain hosts are particularly important to your business, create a dashboard designated to monitoring only those hosts, and then pin charts from their host overview pages to that dashboard, all with almost no typing.

Memory analysis

Use the Memory analysis section to analyze:

Memory usage—total memory, memory used, and memory reclaimable
Page faults—page faults per second
Swap usage—swap total and swap used

Leverage these charts

Select in the upper-right corner of a chart to:

Show in data explorer—Opens the Data explorer for the associated query, so you can view the associated query, explore the data more in-depth, adjust the chart settings, and pin the chart to your own dashboard.
Pin to dashboard—Pins a copy of the selected chart to any dashboard you can edit. For example, if certain hosts are particularly important to your business, create a dashboard designated to monitoring only those hosts, and then pin charts from their host overview pages to that dashboard, all with almost no typing.

Events

The events section displays recent host events that Davis AI has generated, with a clear timeline view to quickly identify critical events. The timeline view is interactive, filtering events around a specific moment, making it easier to isolate a particular event. In addition, different event types are color-coded for easier and faster identification and browsing.

Show single card—Opens an Events card for the selected host.

Logs

The log viewer timeline is interactive, allowing a global timeline selection. Use it to identify issues around a specific log event and see how it relates to hosting performance or processes.

The entire host page time selection will match what is selected in the log viewer. In this way, an error log can be easily compared to host performance metrics or process metrics around the time the log error took place. The same timeline selection will arrive on the event card.
You can filter logs based on process group, status, log level, and other parameters, allowing searching, for example, just for error logs or for logs about a certain process.

Leverage this information

Select in the upper-right corner of the Logs section to:

Go to Log Viewer—Opens the Log Viewer page filtered by the selected host.
Create metric—Opens the Log metrics page with the Query value set to the selected host.