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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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publicdns	Net/DNS/Publicdns: update the IPv6 range that we use to recreate route endpoint for control D	2 months ago
recursive	all: use Go 1.22 range-over-int	3 months ago
resolvconffile	clientupdate, net/dns: fix some "tailsacle" typos	3 months ago
resolver	net/dns: re-query system resolvers on no-upstream resolver failure on apple platforms (#12398)	3 weeks ago
config.go	all: update copyright and license headers	1 year ago
debian_resolvconf.go	all: update copyright and license headers	1 year ago
direct.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
direct_linux.go	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	2 weeks ago
direct_notlinux.go	all: update copyright and license headers	1 year ago
direct_test.go	clientupdate, net/dns: fix some "tailsacle" typos	3 months ago
flush_default.go	all: update copyright and license headers	1 year ago
flush_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	3 weeks ago
ini.go	all: update copyright and license headers	1 year ago
ini_test.go	all: update copyright and license headers	1 year ago
manager.go	net/dns: fix crash in tests	4 weeks ago
manager_darwin.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_default.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_freebsd.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_linux.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_linux_test.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_openbsd.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
manager_tcp_test.go	net/dns: don't set MatchDomains on Apple platforms when no upstream nameservers available (#12334)	4 weeks ago
manager_test.go	net/dns: fix crash in tests	4 weeks ago
manager_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	3 weeks ago
manager_windows_test.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
nm.go	all: cleanup unused code, part 2 (#10670)	6 months ago
noop.go	all: update copyright and license headers	1 year ago
nrpt_windows.go	net/dns: unconditionally write NRPT rules to local settings	3 months ago
openresolv.go	net/dns: log more info when openresolv commands fail	5 months ago
osconfig.go	net/dns: fix typo in OSConfig logging (#12330)	4 weeks ago
osconfig_test.go	all: update copyright and license headers	1 year ago
resolvconf-workaround.sh	all: update copyright and license headers	1 year ago
resolvconf.go	net/dns: properly detect newer debian resolvconf	9 months ago
resolvconfpath_default.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	11 months ago
resolvconfpath_gokrazy.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	11 months ago
resolvd.go	all: update copyright and license headers	1 year ago
resolved.go	health, all: remove health.Global, finish plumbing health.Tracker	2 months ago
utf.go	all: update copyright and license headers	1 year ago
utf_test.go	all: update copyright and license headers	1 year ago
wsl_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	3 weeks ago