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-rw-r--r--docs/guides/configure/performance.md6
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diff --git a/docs/guides/configure/performance.md b/docs/guides/configure/performance.md
index 5f93a8cd4..8e0108979 100644
--- a/docs/guides/configure/performance.md
+++ b/docs/guides/configure/performance.md
@@ -155,6 +155,12 @@ All the settings are found in the `[global]` section of `netdata.conf`:
dbengine multihost disk space = 256
```
+Metric retention is not important in certain use cases, such as:
+ - Data collection nodes stream collected metrics collected to a centralization point.
+ - Data collection nodes export their metrics to another time series DB, or are scraped by Prometheus
+ - Netdata installed only during incidents, to get richer information.
+In such cases, you may not want to use the dbengine at all and instead opt for memory mode `memory mode = ram` or `memory mode = none`.
+
## Run Netdata behind Nginx
A dedicated web server like Nginx provides far more robustness than the Agent's internal [web server](/web/README.md).