waht' is the rule of autoscaler

## Environment details:

* local deployment, native ubuntu, Mac OS, Kubernetes, ...
* version of docker, ubuntu, ...

## Steps to reproduce the issue:

1.
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## Provide the expected results and outputs:

```
output comes here
```

## Provide the actual results and outputs:

```
output comes here
```

## Additional information you deem important:
* issue happens only occasionally or under certain circumstances
* changes you did or observed in the environment

No file, test, reproduction, or requested change is provided. First clarify whether this is a documentation request or a defect, then locate the autoscaler entry point and any existing tests. Done means the autoscaler rules are documented or the reported problem has a reproducible scope and agreed fix.

Written by the indexing model from the issue text.