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* Remove obsolete header cache why: Was fall back for the case that the DB table was inaccessible before `FC` module reorg. * Add the number of unused connected peers to metric * Update docu, add Grafana example why: Provides useful settings, e.g. for memory debugging * Re-calibrate blocks queue for import why: Old queue setup provided a staging area which was much too large consuming too much idle memory. Also the command-line re-calibrating for debugging was much too complicated. And the naming for the old setup was wrong: There is no max queue size. Rather there is a HWM where filling the queue stops when reached. The currently tested size allows for 1.5k blocks on the queue. * Rename hidden command-line option for debug/re-calibrating blocks queue