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Update functions.md

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Added a note on the Alias functions (e.g. `replaceAlias`) explaining a possible conflict with other Transforms applied on the Grafana Dashboard.
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Marin N
2024-04-08 18:06:09 +03:00
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@@ -326,6 +326,13 @@ Replace metric name using pattern. Pattern is regex or regular string. If regex
For more details see [String.prototype.replace()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace) function.
**NOTE:** Other transforms in Grafana Dashboard, like ["Join by label"](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#join-by-labels) will overwrite the alias functions.
This will happen because the Grafana Dashboard transforms will be applied on the raw data returned by a query.
If such issues arise, you can always use other Dashboard transforms, like:
* [Rename by regex](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#rename-by-regex) for fields names
* [Value mappings > Regex ](https://grafana.com/docs/grafana/latest/panels-visualizations/configure-value-mappings/#regex) for cell values
Examples:
```
CPU system time