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An afk warden alert that simply alerts you when your backpack is empty. For skills like firemaking so when you run out of logs it will let you know!
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For firemaking you can use the progress bar alerter. For most other inventory related things you can use "dialogtextsimple" alerter which will trigger when any dialog window open (like the text that tells you your inventory is full).
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Firemaking does not use progress bar. I use xpcounter alert for firemaking
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