Improve finding unused datasources

CHANGES.rst

@@ -5,6 +5,7 @@ grafana-wtf changelog
 
 in progress
 ===========
+- Improve finding unused datasources. Thanks, @meyerder.
 
 2023-07-21 0.15.1
 =================

grafana_wtf/core.py

@@ -451,6 +451,9 @@ def explore_dashboards(self):
         # as well as dashboards to datasources and vice versa.
         ix = Indexer(engine=self)
 
+        # Those dashboard names or uids will be ignored.
+        ignore_dashboards = ["-- Grafana --", "-- Mixed --", "grafana", "-- Dashboard --"]
+
         # Compute list of exploration items, looking for dashboards with missing data sources.
         results = []
         for uid in sorted(ix.dashboard_by_uid):
@@ -460,7 +463,11 @@ def explore_dashboards(self):
             datasources_existing = []
             datasources_missing = []
             for datasource_item in datasource_items:
-                if datasource_item.name in ["-- Grafana --", "-- Mixed --"]:
+                if (
+                    datasource_item.name in ignore_dashboards
+                    or datasource_item.uid in ignore_dashboards
+                    or datasource_item.type == "grafana"
+                ):
                     continue
                 datasource_by_uid = ix.datasource_by_uid.get(datasource_item.uid)
                 datasource_by_name = ix.datasource_by_name.get(datasource_item.name)