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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>		1 month ago
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batching_conn.go	wgengine/magicsock: improve don't fragment bit set/get support	9 months ago
blockforever_conn.go	wgengine/magicsock: improve don't fragment bit set/get support	9 months ago
debughttp.go	all: remove LenIter, use Go 1.22 range-over-int instead	3 months ago
debugknobs.go	all: cleanup unused code, part 2 (#10670)	5 months ago
debugknobs_stubs.go	wgengine/magicsock: replace CanPMTUD() with ShouldPMTUD()	9 months ago
derp.go	tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing	1 month ago
derp_test.go	net/netcheck,wgengine/magicsock: align DERP frame receive time heuristics	2 months ago
discopingpurpose_string.go	wgengine/magicsock: implement probing of UDP path lifetime (#10844)	4 months ago
endpoint.go	wgengine/magicsock: prefer link-local addresses to private ones	3 months ago
endpoint_default.go	all: adjust some build tags for plan9	9 months ago
endpoint_stub.go	all: adjust some build tags for plan9	9 months ago
endpoint_test.go	wgengine/magicsock: implement probing of UDP path lifetime (#10844)	4 months ago
endpoint_tracker.go	wgengine/magicsock: only cache N most recent endpoints per-Addr	10 months ago
endpoint_tracker_test.go	all: use Go 1.22 range-over-int	2 months ago
magicsock.go	health: add Tracker type, in prep for removing global variables	1 month ago
magicsock_default.go	wgengine/magicsock: delete unused stuff	10 months ago
magicsock_linux.go	wgengine/magicsock: simplify tryEnableUDPOffload() (#9872)	8 months ago
magicsock_test.go	health: add Tracker type, in prep for removing global variables	1 month ago
magicsock_unix_test.go	all: update copyright and license headers	1 year ago
peermap.go	wgengine/magicsock: allow disco communication without known endpoints	2 months ago
peermtu.go	magicsock: mute noisy expected peer mtu related error (#10870)	4 months ago
peermtu_darwin.go	wgengine/magicsock: improve don't fragment bit set/get support	9 months ago
peermtu_linux.go	wgengine/magicsock: improve don't fragment bit set/get support	9 months ago
peermtu_stubs.go	magicsock: mute noisy expected peer mtu related error (#10870)	4 months ago
peermtu_unix.go	wgengine/magicsock: replace CanPMTUD() with ShouldPMTUD()	9 months ago
rebinding_conn.go	wgengine/magicsock: improve don't fragment bit set/get support	9 months ago