Add diagnostics support to Open-Meteo (#64645)

.coveragerc

@@ -785,6 +785,7 @@ omit =
     homeassistant/components/onvif/event.py
     homeassistant/components/onvif/parsers.py
     homeassistant/components/onvif/sensor.py
+    homeassistant/components/open_meteo/diagnostics.py
     homeassistant/components/open_meteo/weather.py
     homeassistant/components/opencv/*
     homeassistant/components/openevse/sensor.py

homeassistant/components/open_meteo/diagnostics.py

@@ -0,0 +1,30 @@
+"""Diagnostics support for Open-Meteo."""
+from __future__ import annotations
+
+import json
+from typing import Any
+
+from open_meteo import Forecast
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_LATITUDE, CONF_LONGITUDE
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+
+from .const import DOMAIN
+
+TO_REDACT = {
+    CONF_LATITUDE,
+    CONF_LONGITUDE,
+}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: DataUpdateCoordinator[Forecast] = hass.data[DOMAIN][entry.entry_id]
+    # Round-trip via JSON to trigger serialization
+    data: dict[str, Any] = json.loads(coordinator.data.json())
+    return async_redact_data(data, TO_REDACT)