Being more sensitive to air quality, coal miners would bring canaries with them and, when the bird would fall unresponsive, it was time for them to all leave before they all succumbed to an imminent grave danger.
Elvira currently props up Russia's economy. She can't control everything, but she is competent.
Elvira also tried to resign at the start of the war. Due to her competency. Because she knew what her future was in Russia now.
https://www.businessinsider.com/russias-top-central-banker-step-down-ukraine-war-putin-2022-3
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