Prometheus to support input_number (#58964)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

homeassistant/components/prometheus/__init__.py

@@ -1,4 +1,5 @@
 """Support for Prometheus metrics export."""
+from contextlib import suppress
 import logging
 import string
 
@@ -284,13 +285,24 @@ class PrometheusMetrics:
         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)
+        if unit := self._unit_string(state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)):
+            metric = self._metric(
+                f"input_number_state_{unit}",
+                self.prometheus_cli.Gauge,
+                f"State of the input number measured in {unit}",
+            )
+        else:
+            metric = self._metric(
+                "input_number_state",
+                self.prometheus_cli.Gauge,
+                "State of the input number",
+            )
+
+        with suppress(ValueError):
+            value = self.state_as_number(state)
+            if state.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == TEMP_FAHRENHEIT:
+                value = fahrenheit_to_celsius(value)
+            metric.labels(**self._labels(state)).set(value)
 
     def _handle_device_tracker(self, state):
         metric = self._metric(

tests/components/prometheus/test_init.py

@@ -20,6 +20,7 @@ from homeassistant.const import (
     DEGREE,
     ENERGY_KILO_WATT_HOUR,
     EVENT_STATE_CHANGED,
+    TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
 )
 from homeassistant.core import split_entity_id
@@ -201,6 +202,13 @@ async def test_sensor_unit(hass, hass_client):
     sensor5.entity_id = "sensor.sps30_pm_1um_weight_concentration"
     await sensor5.async_update_ha_state()
 
+    sensor6 = DemoSensor(
+        None, "Target temperature", 22.7, None, None, TEMP_CELSIUS, None
+    )
+    sensor6.hass = hass
+    sensor6.entity_id = "input_number.target_temperature"
+    await sensor6.async_update_ha_state()
+
     await hass.async_block_till_done()
     body = await generate_latest_metrics(client)
 
@@ -228,6 +236,12 @@ async def test_sensor_unit(hass, hass_client):
         'friendly_name="SPS30 PM <1µm Weight concentration"} 3.7069' in body
     )
 
+    assert (
+        'input_number_state_celsius{domain="input_number",'
+        'entity="input_number.target_temperature",'
+        'friendly_name="Target temperature"} 22.7' in body
+    )
+
 
 async def test_sensor_without_unit(hass, hass_client):
     """Test prometheus metrics for sensors without a unit."""
@@ -355,6 +369,11 @@ async def test_input_number(hass, hass_client):
     number2._attr_name = None
     await number2.async_update_ha_state()
 
+    number3 = DemoSensor(None, "Retry count", 5, None, None, None, None)
+    number3.hass = hass
+    number3.entity_id = "input_number.retry_count"
+    await number3.async_update_ha_state()
+
     await hass.async_block_till_done()
     body = await generate_latest_metrics(client)
 
@@ -370,6 +389,12 @@ async def test_input_number(hass, hass_client):
         'friendly_name="None"} 60.0' in body
     )
 
+    assert (
+        'input_number_state{domain="input_number",'
+        'entity="input_number.retry_count",'
+        'friendly_name="Retry count"} 5.0' in body
+    )
+
 
 async def test_battery(hass, hass_client):
     """Test prometheus metrics for battery."""