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9 changes: 9 additions & 0 deletions README.md
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Expand Up @@ -200,6 +200,15 @@ For additional details please refer to [xo/dburl](https://github.com/xo/dburl) d

## Miscellaneous

<details>
<summary>Handling NULL values</summary>

Queries that return `NULL` values are supported, but they are not rendered as metrics. It's useful for situations, when
the result set depends on some conditions, so it may be empty. Whenever a query returns `NULL` values, the exporter
logs a message at the `Debug` level. If your query constantly returns `NULL` values, it most likely means that you need
to revisit your query logic.
</details>

<details>
<summary>Multiple database connections</summary>

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2 changes: 1 addition & 1 deletion VERSION
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0.18.0
0.18.1
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