Made embedded colors work logically

main.py

@@ -12,6 +12,23 @@ import config
 log = logging.getLogger('healthbot')
 
 
+def _health_color(results):
+    """Embed color on a green -> yellow -> red gradient based on the share of
+    critical services that are down (0% down = green, 50% = yellow, 100% = red)."""
+    critical = [r for r in results if r.get('critical', True)]
+    if not critical:
+        return discord.Color.from_rgb(0, 255, 0)
+    down = sum(1 for r in critical if not r['up'])
+    ratio = down / len(critical)
+    if ratio <= 0.5:
+        t = ratio / 0.5
+        red, green, blue = round(255 * t), 255, 0
+    else:
+        t = (ratio - 0.5) / 0.5
+        red, green, blue = 255, round(255 * (1 - t)), 0
+    return discord.Color.from_rgb(red, green, blue)
+
+
 class HealthBot(discord.Client):
     def __init__(self):
         intents = discord.Intents.default()
@@ -61,8 +78,7 @@ class HealthBot(discord.Client):
         return await checks.run_checks(session, config.CHECK_TIMEOUT)
 
     def build_embed(self, results):
-        all_up = all(r['up'] for r in results if r.get('critical', True))
-        color = discord.Color.green() if all_up else discord.Color.red()
+        color = _health_color(results)
         embed = discord.Embed(
             title='Service Health',
             color=color,