kthxbye
                                
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                        `-extend-with-prefix` option replace the default value
Hi there! Thank you for develop this app!
My problem is then I use -extend-with-prefix AA- to extend searching silenced alerts, I am expecting that all silences starting from AA- and default value ACK! should promote. But in my case ACK! didn't working.
alertmanager: v 0.21.0 kthxbye: v0.15