[chore] [receiver/mysqlreceiver] Update readme (open-telemetry#27656)

**Description:** It's not obvious from the readme that you won't get all metrics listed in metadata by default. Suggest small doc update to make it clearer. **Link to tracking Issue:** **Testing:** Observed with running collector. **Documentation:** See above. --------- Co-authored-by: Daniel Jaglowski <[email protected]> Co-authored-by: Curtis Robert <[email protected]>
jmsnll · Nov 12, 2023 · 5c79693 · 5c79693
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diff --git a/receiver/mysqlreceiver/README.md b/receiver/mysqlreceiver/README.md
@@ -16,6 +16,9 @@
 
 This receiver queries MySQL's global status and InnoDB tables.
 
+Some metrics will not appear if their corresponding feature is inactive.  
+There are also optional metrics that you must specify in your configuration to collect,  listed in [documentation.md](./documentation.md) 
+
 ## Prerequisites
 
 This receiver supports MySQL version 8.0