The 'preserve' flag can be used to mark a peer so it is not removed or modified on upgrades. In addition, groups containing preserved peers are not removed. Fixes: #557  | 
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| gluon/upgrade | ||
				The 'preserve' flag can be used to mark a peer so it is not removed or modified on upgrades. In addition, groups containing preserved peers are not removed. Fixes: #557  | 
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| gluon/upgrade | ||