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tailscale/control
Brad Fitzpatrick 723c775dbb tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing
This adds a health.Tracker to tsd.System, accessible via
a new tsd.System.HealthTracker method.

In the future, that new method will return a tsd.System-specific
HealthTracker, so multiple tsnet.Servers in the same process are
isolated. For now, though, it just always returns the temporary
health.Global value. That permits incremental plumbing over a number
of changes. When the second to last health.Global reference is gone,
then the tsd.System.HealthTracker implementation can return a private
Tracker.

The primary plumbing this does is adding it to LocalBackend and its
dozen and change health calls. A few misc other callers are also
plumbed. Subsequent changes will flesh out other parts of the tree
(magicsock, controlclient, etc).

Updates #11874
Updates #4136

Change-Id: Id51e73cfc8a39110425b6dc19d18b3975eac75ce
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
13 hours ago
..
controlbase all: use Go 1.22 range-over-int 1 week ago
controlclient tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing 13 hours ago
controlhttp tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing 13 hours ago
controlknobs all: deprecate Node.Capabilities (more), remove PeerChange.Capabilities [capver 89] 1 month ago