Two more per-service boards, cut from the withdrawn combined services
board: the log store (4 panels) and the metrics store (5).
The combined board was one page carrying panels for four different
services; the seams were already there, so this is a re-cut rather than
new authoring. Each board's subject is one service, and the services
page that remains will carry only panels whose subject is the *set*.
Both were imported by the operator before being committed here, so the
queries are known to draw against the live stores rather than only
parsing.
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