If you add a
| search m=145
at the end of your search query, that will only cause it to fire when the secondary is active. Then, in your alert settings, turn on Throttling and set the time range to 2 hours. That should do what you need.
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Unfortunately, there doesn't seem to be a way to add a symbol to the data values in the chart. Your best bet is to probably add a title to the overlay axis, giving it the title of "Percent".
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