[metrics] Fix io metrics documentation references (#10630)

* Fix broken image & dashboard links in rendered online documentation
* Fix prerequisite version in documentation (do not use milestone version)

Signed-off-by: Robert Bach <openhab@mortalsilence.net>

diff --git a/bundles/org.openhab.io.metrics/README.md b/bundles/org.openhab.io.metrics/README.md
index 2f5c9cfa633ceb8a1950cbc64d81f850d4cc3b7d..b73fa1c9770c5dce9be22193a6d0f1d9393c7075 100644 (file)
--- a/bundles/org.openhab.io.metrics/README.md
+++ b/bundles/org.openhab.io.metrics/README.md
@@ -7,7 +7,7 @@ The metrics service provides
 
 ## Precondition
 
-The openHAB core metrics must be available (OH version >= 3.1.0 M2 is necessary).
+The openHAB core metrics must be available (at least OH version 3.1).
 
 ## Provided metrics
 
@@ -89,7 +89,7 @@ It should be possible to add any of these, especially the ones using a pull mech
 ## Grafana
 
 You can now visualize the results in Grafana. Micrometer provides a public [Grafana dashboard here](https://grafana.com/grafana/dashboards/4701). 
-I adapted it a little bit to include the openHAB metrics. You can download it here [Dashboard](docs/dashboard.json). 
+I adapted it a little bit to include the openHAB metrics. You can download it here [Dashboard](doc/dashboard.json). 
 This has been tested with Prometheus - for other monitoring systems adaptions to the dashboard might be necessary.  
 
 Here are some screenshots: