From 7157fc050cf48017951dcf6c2a6c17f9462e0dca Mon Sep 17 00:00:00 2001
From: Chris Akritidis <43294513+cakrit@users.noreply.github.com>
Date: Fri, 14 May 2021 08:50:52 -0700
Subject: Update performance.md (#11144)

---
 docs/guides/configure/performance.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/guides/configure/performance.md b/docs/guides/configure/performance.md
index 5f93a8cd42..8e0108979b 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).
-- 
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