Extensions limitations
Learn about the limitations and requirements of ActiveGate extensions.
Supported ActiveGate types
ActiveGate extensions are executed by an Environment ActiveGate. Note that you can't execute ActiveGate extensions using an Environment ActiveGate that's configured for multi-environment support.
Quotas
The ActiveGate extension module limits the amount of data sent to Dynatrace Server.
The data is trimmed after reaching the limit, but all the data up to the limit is still sent. For some entities, the plugin module raises an exception when the limit is reached. The exception is displayed in Settings > Monitoring > Monitored technologies for a related extension.
The table below presents the entities where limits apply, along with the maximum values.
| Entity | Description | Max. value | Exception |
|---|---|---|---|
| Groups | Number of device groups created per minute, per endpoint | 500 | Yes |
| Group Properties limit | Maximum number of custom properties reported per process group, custom device group | 20 | No |
| Devices | Number of devices created per minute, per endpoint | 5000 | Yes |
| Properties limit | Maximum number of custom properties reported per host, process group instance, custom device | 20 | No |
| Property value length | Length of custom property value string | 200 | No |
| Property key length | Length of custom property key string | 100 | No |
| Measurements limit | Number of metrics including dimensions per minute, per endpoint | 100 000 | Yes |
| Events limit | Number of events per minute, per endpoint | 100 | Yes |
| Event title length | Length of event title string | 1 024 | No |
| Event description length | Length of event description string | 10 240 | No |
| Dimension values | Number of dimension values per metric | 100 | No |
| Prometheus histogram metrics bucket ingestion limit | Maximum number of ingested Prometheus histogram metrics buckets. If the number of buckets is higher, none of them are ingested. | 50 | Yes |
Filtering metrics, problems, and events
Remember there are several filtering systems. Custom metrics and events are limited by quotas. If ActiveGate module quotas are in use, you'll find this information in the Remote Plugin Module logs.
Naming Python extension files
All extensions are written in Python. Because of how Python works, there may be ambiguities when Python uses import statements. Namely, if there are multiple extensions using files that are identically named, there may be issues importing those files. Because of this, you should use unique file names that are unlikely to appear in other extensions. For example, instead of a generic file name like utils.py, use something like my_extension_utils.py.