Which devices need how much power? To find out, there are measuring sockets such as the Shelly Plug S, which can also be read out via MQTT.
check_shelly - a monitoring/nagios plugin to monitor Shelly IOT relay switches and power meter devices
Grafana Stromverbrauch richtig Darstellen Shelly Plug S
Visualizing your smart home with Grafana and Home Assistant
Home power monitoring using the Shelly EM with Grafana, InfluxDB, Node-RED and MQTT
Tutorials Grafana Labs
Tutorials Grafana Labs
Grafana Dashboard Tutorial: How to Get Started
Dashboards Grafana Labs
Shelly EM – Power Monitoring in Grafana / Influx – Mat's Hideout
Swimming pool temperature sensor with the ESP » jjk1's Website
Loki - Access logs the smart way · Anais Urlichs
How I fell in love with logs thanks to Grafana Loki
Streaming real-time sensor data to Grafana using MQTT and Grafana Live
Tutorials Grafana Labs
Building a Dashboard with Grafana, InfluxDB, and PowerCLI - Wahl Network