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Andrea Gottardo a8ee83e2c5 health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406) ... Updates tailscale/tailscale#4136 This PR is the first round of work to move from encoding health warnings as strings and use structured data instead. The current health package revolves around the idea of Subsystems. Each subsystem can have (or not have) a Go error associated with it. The overall health of the backend is given by the concatenation of all these errors. This PR polishes the concept of Warnable introduced by @bradfitz a few weeks ago. Each Warnable is a component of the backend (for instance, things like 'dns' or 'magicsock' are Warnables). Each Warnable has a unique identifying code. A Warnable is an entity we can warn the user about, by setting (or unsetting) a WarningState for it. Warnables have: - an identifying Code, so that the GUI can track them as their WarningStates come and go - a Title, which the GUIs can use to tell the user what component of the backend is broken - a Text, which is a function that is called with a set of Args to generate a more detailed error message to explain the unhappy state Additionally, this PR also begins to send Warnables and their WarningStates through LocalAPI to the clients, using ipn.Notify messages. An ipn.Notify is only issued when a warning is added or removed from the Tracker. In a next PR, we'll get rid of subsystems entirely, and we'll start using structured warnings for all errors affecting the backend functionality. Signed-off-by: Andrea Gottardo <andrea@gottardo.me>		2 weeks ago
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auto.go	control/controlclient: delete unused Client.Login Oauth2Token field	2 months ago
client.go	control/controlclient: delete unused Client.Login Oauth2Token field	2 months ago
controlclient_test.go	all: use Go 1.22 range-over-int	3 months ago
direct.go	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	2 weeks ago
direct_test.go	net/netns, net/dns/resolver, etc: make netmon required in most places	2 months ago
map.go	tailcfg,all: add/plumb Node.IsJailed	2 months ago
map_test.go	all: use Go 1.22 range-over-int	3 months ago
noise.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
noise_test.go	net/netns, net/dns/resolver, etc: make netmon required in most places	2 months ago
sign.go	all: update copyright and license headers	1 year ago
sign_supported.go	control/controlclient: support certstore without cgo	9 months ago
sign_supported_test.go	all: update copyright and license headers	1 year ago
sign_unsupported.go	control/controlclient: support certstore without cgo	9 months ago
status.go	all: implement AppendText alongside MarshalText (#9207)	10 months ago