Merge pull request #8 from desultory/dev

clean up cached exporter

Author: desultory

src/prometheus_exporter/cached_exporter.py

@@ -58,12 +58,9 @@ def cache_age(self) -> int:
             self.logger.debug("[%s] Cache age: %d" % (self.name, cache_age))
             return time() - getattr(self, "_cache_time", 0)
 
-        async def get_metrics(self, label_filter={}) -> list:
+        async def get_metrics(self, label_filter=None) -> list:
             """Get metrics from the exporter, respecting label filters and caching the result."""
-            for key, value in label_filter.items():
-                if key not in self.labels and self.labels[key] != value:
-                    self.logger.debug("Label filter check failed: %s != %s", self.labels, label_filter)
-                    return []
+            label_filter = label_filter or {}
 
             if not hasattr(self, "_cached_metrics") or self.cache_age >= self.cache_life:
                 if new_metrics := await super().get_metrics(label_filter=label_filter):