why keep track any more?

esphome/common/sensor/rssi_sensor.config.yaml

@@ -1,3 +1,16 @@
-platform: wifi_signal
-name: RSSI
-update_interval: 60s
+# Example configuration entry with 2 sensors and filter
+sensor:
+  - platform: wifi_signal # Reports the WiFi signal strength/RSSI in dB
+    name: "RSSI"
+    id: local_wifi_signal_db
+    update_interval: 60s
+    entity_category: "diagnostic"
+
+  - platform: copy # Reports the WiFi signal strength in %
+    source_id: local_wifi_signal_db
+    name: "WiFi Signal Strength"
+    filters:
+      - lambda: return min(max(2 * (x + 100.0), 0.0), 100.0);
+    unit_of_measurement: "%"
+    entity_category: "diagnostic"
+    device_class: ""

esphome/common/sensor/uptime_sensor.config.yaml

@@ -1,4 +1,6 @@
-platform: uptime
-name: Uptime
-disabled_by_default: true
-icon: mdi:timer-check
+sensor:
+  - platform: uptime
+    name: Uptime
+    id: local_uptime_sensor
+    disabled_by_default: true
+    icon: mdi:timer-check