prometheus: Add help descriptions, improve metric names

lib/view/prometheus.py

@@ -3,34 +3,42 @@ Rendering weather data in the Prometheus format.
 
 """
 
-EXPORTED_FIELDS = [
-    "FeelsLikeC", "FeelsLikeF", "cloudcover", "humidity",
-    "precipMM", "pressure", "temp_C", "temp_F", "uvIndex",
-    "visibility", "winddirDegree", "windspeedKmph",
-    "windspeedMiles",
-    ]
 
-def _render_current(data):
+EXPORTED_FIELDS = {
+    "FeelsLikeC":("Feels Like Temperature in Celsius", "temperature_feels_like_celsius"),
+    "FeelsLikeF":("Feels Like Temperature in Fahrenheit", "temperature_feels_like_fahrenheit"),
+    "cloudcover":("Cloud Coverage in Percent", "cloudcover_percentage"),
+    "humidity":("Humidity in Percent", "humidity_percentage"),
+    "precipMM":("Precipitation (Rainfall) in mm", "precipitation_mm"),
+    "pressure":("Air pressure in hPa", "pressure_hpa"),
+    "temp_C":("Temperature in Celsius", "temperature_celsius"),
+    "temp_F":("Temperature in Fahrenheit", "temperature_fahrenheit"),
+    "uvIndex":("Ultaviolet Radiation Index", "uv_index"),
+    "visibility":("Visible Distance in Kilometres", "visibility"),
+    "winddirDegree":("Wind Direction in Degree", "winddir_degree"),
+    "windspeedKmph":("Wind Speed in Kilometres per Hour", "windspeed_kmph"),
+    "windspeedMiles":("Wind Speed in Miles per Hour", "windspeed_mph"),
+    }
+
+EXPORTED_FIELDS_DESC = {
+    "weatherDesc":("Weather Description", "weather_desc"),
+    "winddir16Point":("Wind Direction on a 16-wind compass rose", "winddir_16_point"),
+    }
+
+def _render_crurent(data):
 
     output = []
     current_condition = data["current_condition"][0]
     for field in EXPORTED_FIELDS:
         try:
-            output.append("%s{forecast=\"0h\"} %s" % (field, current_condition[field]))
+            output.append("# %s\n%s{forecast=\"0h\"} %s" % (EXPORTED_FIELDS[field][0], EXPORTED_FIELDS[field][1], current_condition[field]))
+        except IndexError:
+            pass
+    for field in EXPORTED_FIELDS_DESC:
+        try:
+            output.append("# %s\n%s{forecast=\"0h\", description=\"%s\"} 1" % EXPORTED_FIELDS_DESC[field][0], EXPORTED_FIELDS_DESC[field][1], current_condition[field])
         except IndexError:
             pass
-
-    try:
-        weather_desc = current_condition["weatherDesc"][0]["value"]
-        output.append("weatherDesc{forecast=\"0h\", description=\"%s\"} 1" % weather_desc)
-    except IndexError:
-        pass
-
-    try:
-        winddir16point = current_condition["winddir16Point"]
-        output.append("winddir16Point{forecast=\"0h\", description=\"%s\"} 1" % winddir16point)
-    except IndexError:
-        pass
 
     return "\n".join(output)+"\n"