Add Min and Event Count Metrics To Prometheus (#10530)

* Added min and Events sensor types to prometheus

* Updated prometheus client and fixed invalid swith state

* Added metric to count number of times an automation is triggered

* Removed assumption that may not apply to everybody

* Fixed tests

* Updated requirements_test_all

* Fixed unit tests

homeassistant/components/prometheus.py

@@ -19,7 +19,7 @@
 from homeassistant.helpers import state as state_helper
 from homeassistant.util.temperature import fahrenheit_to_celsius
 
-REQUIREMENTS = ['prometheus_client==0.0.19']
+REQUIREMENTS = ['prometheus_client==0.0.21']
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -189,6 +189,14 @@ def _handle_sensor(self, state):
                 'electricity_usage_w', self.prometheus_client.Gauge,
                 'Currently reported electricity draw in Watts',
             ),
+            'min': (
+                'sensor_min', self.prometheus_client.Gauge,
+                'Time in minutes reported by a sensor'
+            ),
+            'Events': (
+                'sensor_event_count', self.prometheus_client.Gauge,
+                'Number of events for a sensor'
+            ),
         }
 
         unit = state.attributes.get('unit_of_measurement')
@@ -212,12 +220,25 @@ def _handle_switch(self, state):
             self.prometheus_client.Gauge,
             'State of the switch (0/1)',
         )
-        value = state_helper.state_as_number(state)
-        metric.labels(**self._labels(state)).set(value)
+
+        try:
+            value = state_helper.state_as_number(state)
+            metric.labels(**self._labels(state)).set(value)
+        except ValueError:
+            pass
 
     def _handle_zwave(self, state):
         self._battery(state)
 
+    def _handle_automation(self, state):
+        metric = self._metric(
+            'automation_triggered_count',
+            self.prometheus_client.Counter,
+            'Count of times an automation has been triggered',
+        )
+
+        metric.labels(**self._labels(state)).inc()
+
 
 class PrometheusView(HomeAssistantView):
     """Handle Prometheus requests."""

requirements_all.txt

@@ -560,7 +560,7 @@ pocketcasts==0.1
 proliphix==0.4.1
 
 # homeassistant.components.prometheus
-prometheus_client==0.0.19
+prometheus_client==0.0.21
 
 # homeassistant.components.sensor.systemmonitor
 psutil==5.4.1

requirements_test_all.txt

@@ -113,7 +113,7 @@ pilight==0.1.1
 pmsensor==0.4
 
 # homeassistant.components.prometheus
-prometheus_client==0.0.19
+prometheus_client==0.0.21
 
 # homeassistant.components.zwave
 pydispatcher==2.0.5

tests/components/test_prometheus.py

@@ -30,4 +30,6 @@ def test_view(prometheus_client):  # pylint: disable=redefined-outer-name
     assert len(body) > 3  # At least two comment lines and a metric
     for line in body:
         if line:
-            assert line.startswith('# ') or line.startswith('process_')
+            assert line.startswith('# ') \
+                or line.startswith('process_') \
+                or line.startswith('python_info')