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add to starlark readme
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@ssoroka
ssoroka committed Dec 1, 2020
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Expand Up @@ -102,6 +102,12 @@ If you would like to see support for something else here, please open an issue.

### Common Questions

**What's the performance cost to using Starlark?**

In local tests, it takes about 1µs (1 microsecond) to run a modest script to process one
metric. This is going to vary with the size of your script, but the total impact is minimal.
At this pace, it's likely not going to be the bottleneck in your Telegraf setup.

**How can I drop/delete a metric?**

If you don't return the metric it will be deleted. Usually this means the
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