Remove Old MQTT

Configuration
1

I have these warnings in my log.
How do i delete them?
Don’t see any sensors/devices for this.

2024-02-02 19:10:20.817 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON measure-power: 'null'
2024-02-02 19:10:20.817 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON measure-temperature: 'null'
2024-02-02 19:10:20.817 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON measure-humidity: 'null'
2024-02-02 19:10:20.818 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON measure-temperature: 'null'
2024-02-02 19:10:20.819 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON measure-humidity: 'null'
2024-02-02 19:10:21.110 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON alarm-contact: 'null'
2024-02-02 19:10:21.110 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON alarm-contact: 'null'
2024-02-02 19:10:21.110 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON alarm-motion: 'null'
2024-02-02 19:10:21.153 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON volume-mute: 'null'
2024-02-02 19:10:21.153 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON volume-down: 'null'
2024-02-02 19:10:21.154 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON volume-up: 'null'
2024-02-02 19:10:21.155 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON onoff: 'null'
2024-02-02 19:10:21.166 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON onoff: 'null'
2024-02-02 19:10:21.166 WARNING (MainThread) [homeassistant.components.mqtt.discovery] Unable to parse JSON onoff: 'null'
2

Delete the discovery topics from your broker by sending a blank retained message to the topic or use MQTT Explorer (free) to do it via a graphical user interface).

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3

Thanks that did the trick !

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