Add input_number state to prometheus metrics (#56507)

* Add input_number to prometheus metrics

* Add prometheus input_number tests

* Removed unused import from test

homeassistant/components/prometheus/__init__.py

@@ -276,6 +276,15 @@ class PrometheusMetrics:
         value = self.state_as_number(state)
         metric.labels(**self._labels(state)).set(value)
 
+    def _handle_input_number(self, state):
+        metric = self._metric(
+            "input_number_state",
+            self.prometheus_cli.Gauge,
+            "State of the input number",
+        )
+        value = self.state_as_number(state)
+        metric.labels(**self._labels(state)).set(value)
+
     def _handle_device_tracker(self, state):
         metric = self._metric(
             "device_tracker_state",

tests/components/prometheus/test_init.py

@@ -7,6 +7,7 @@ import unittest.mock as mock
 import pytest
 
 from homeassistant.components import climate, humidifier, sensor
+from homeassistant.components.demo.number import DemoNumber
 from homeassistant.components.demo.sensor import DemoSensor
 import homeassistant.components.prometheus as prometheus
 from homeassistant.const import (
@@ -99,6 +100,17 @@ async def prometheus_client(hass, hass_client, namespace):
     sensor5.entity_id = "sensor.sps30_pm_1um_weight_concentration"
     await sensor5.async_update_ha_state()
 
+    number1 = DemoNumber(None, "Threshold", 5.2, None, False, 0, 10, 0.1)
+    number1.hass = hass
+    number1.entity_id = "input_number.threshold"
+    await number1.async_update_ha_state()
+
+    number2 = DemoNumber(None, None, 60, None, False, 0, 100)
+    number2.hass = hass
+    number2.entity_id = "input_number.brightness"
+    number2._attr_name = None
+    await number2.async_update_ha_state()
+
     return await hass_client()
 
 
@@ -229,6 +241,18 @@ async def test_view_empty_namespace(hass, hass_client):
         'friendly_name="SPS30 PM <1µm Weight concentration"} 3.7069' in body
     )
 
+    assert (
+        'input_number_state{domain="input_number",'
+        'entity="input_number.threshold",'
+        'friendly_name="Threshold"} 5.2' in body
+    )
+
+    assert (
+        'input_number_state{domain="input_number",'
+        'entity="input_number.brightness",'
+        'friendly_name="None"} 60.0' in body
+    )
+
 
 async def test_view_default_namespace(hass, hass_client):
     """Test prometheus metrics view."""