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