wu-sheng commented on issue #5471:
URL: https://github.com/apache/skywalking/issues/5471#issuecomment-691078698
The reason behind this limitation is, the instance id is part of storage id,
such as ElasticSearch row id. Once you use the super long key, it will break
the storage.
This is the backend default setting
```
/**
* The max length of the service name.
*/
private int serviceNameMaxLength = 70;
/**
* The max length of the service instance name.
*/
private int instanceNameMaxLength = 70;
/**
* The max length of the endpoint name.
*
* <p>NOTICE</p>
* In the current practice, we don't recommend the length over 190.
*/
private int endpointNameMaxLength = 150;
```
If 70 works for you, welcome to submit a pull request to change
`org.apache.skywalking.apm.agent.core.conf.Config`.
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