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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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art	all: use Go 1.22 range-over-int	2 months ago
connstats	all: use Go 1.22 range-over-int	2 months ago
dns	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	2 weeks ago
dnscache	net/dnscache: use parent context to perform lookup	3 weeks ago
dnsfallback	tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing	2 months ago
flowtrack	all: update copyright and license headers	1 year ago
ktimeout	net/ktimeout: add a package to set TCP user timeout	4 months ago
memnet	net/memnet: export the network name (#9111)	10 months ago
netaddr	all: update copyright and license headers	1 year ago
netcheck	net/netcheck: fix probeProto.String result for IPv6 probes	3 weeks ago
neterror	net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791)	1 year ago
netkernelconf	ipn/{ipnlocal,localapi},net/netkernelconf,client/tailscale,cmd/containerboot: optionally enable UDP GRO forwarding for containers (#12410)	3 weeks ago
netknob	all: update copyright and license headers	1 year ago
netmon	net/netmon: remove spammy log statements (#11953)	2 months ago
netns	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	2 months ago
netstat	net/{netns,netstat}: use new x/sys/cpu.IsBigEndian	1 year ago
netutil	net/netmon, add: add netmon.State type alias of interfaces.State	2 months ago
packet	all: use Go 1.22 range-over-int	2 months ago
ping	net/ping: fix ICMP echo code field to 0	10 months ago
portmapper	all: use math/rand/v2 more	3 weeks ago
proxymux	all: cleanup unused code, part 1 (#10661)	6 months ago
routetable	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	2 months ago
socks5	net/socks5: add password auth support	1 year ago
sockstats	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	2 months ago
speedtest	all: update copyright and license headers	1 year ago
stun	derp/xdp,cmd/xdpderper: initial skeleton (#12390)	2 weeks ago
stunserver	all: use Go 1.22 range-over-int	2 months ago
tcpinfo	all: use Go 1.22 range-over-int	2 months ago
tlsdial	tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing	2 months ago
tsaddr	types/views: remove duplicate SliceContainsFunc	2 months ago
tsdial	tsnet,wgengine/netstack: add ListenPacket and tests	4 weeks ago
tshttpproxy	all: use Go 1.22 range-over-int	2 months ago
tstun	net/tstun: do SNAT after filterPacketOutboundToWireGuard	2 months ago
wsconn	net/wsconn: accept a remote addr string and plumb it through	10 months ago