Better metrics.

include/effects.h

@@ -8,8 +8,12 @@ struct EffectEntry {
 	const char* name;
 	bool use_in_cycle;
 	std::function<Effect*()> create;
+#ifdef MQTT_REPORT_METRICS
+	int16_t heap_change_sum;
+	uint16_t run_count;
+#endif
 };
-extern const EffectEntry effects[];
+extern EffectEntry effects[];
 extern const uint8_t effects_size;
 
 extern Effect* current_effect;