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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>		3 weeks ago
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testdata	ipn/ipnlocal: fix the path for writing cert files (#7203)	1 year ago
autoupdate.go	ipn/ipnlocal: periodically run auto-updates when "offline" (#12118)	4 weeks ago
autoupdate_disabled.go	ipn/ipnlocal: periodically run auto-updates when "offline" (#12118)	4 weeks ago
breaktcp_darwin.go	cmd/tailscale: add debug commands to break connections	11 months ago
breaktcp_linux.go	cmd/tailscale: add debug commands to break connections	11 months ago
c2n.go	ipn/ipnlocal: periodically run auto-updates when "offline" (#12118)	4 weeks ago
c2n_pprof.go	ipn/ipnlocal: add c2n /debug/pprof/allocs endpoint	3 months ago
c2n_test.go	util/cmpx: delete now that we're using Go 1.22	5 months ago
cert.go	all: use math/rand/v2 more	4 weeks ago
cert_js.go	ipn/ipnlocal: add c2n method to check on TLS cert fetch status	8 months ago
cert_test.go	all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}	11 months ago
dnsconfig_test.go	util/cmpx: delete now that we're using Go 1.22	5 months ago
drive.go	ipn/ipnlocal: reuse transport across Taildrive remotes	2 months ago
expiry.go	ssh/tailssh: use control server time instead of local time	8 months ago
expiry_test.go	types/netmap, all: make NetworkMap.SelfNode a tailcfg.NodeView	11 months ago
local.go	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	3 weeks ago
local_test.go	ipn/ipnlocal: improve sticky last suggestion	4 weeks ago
loglines_test.go	ipn/ipnlocal, all: plumb health trackers in tests	2 months ago
network-lock.go	ipn/ipnlocal: discard node keys that have been rotated out	4 weeks ago
network-lock_test.go	ipn/ipnlocal: discard node keys that have been rotated out	4 weeks ago
peerapi.go	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	2 months ago
peerapi_h2c.go	all: update copyright and license headers	1 year ago
peerapi_macios_ext.go	net/netmon, add: add netmon.State type alias of interfaces.State	2 months ago
peerapi_test.go	ipn/ipnlocal, all: plumb health trackers in tests	2 months ago
profiles.go	all: use math/rand/v2 more	4 weeks ago
profiles_notwindows.go	ipn/ipnlocal: fix profile duplication	11 months ago
profiles_test.go	various: disable stateful filtering by default (#12197)	1 month ago
profiles_windows.go	ipn/ipnlocal: set default NoStatefulFiltering in ipn.NewPrefs (#12031)	2 months ago
serve.go	all: use Go 1.22 range-over-int	3 months ago
serve_test.go	ipn/ipnlocal, all: plumb health trackers in tests	2 months ago
ssh.go	ipnlocal: log failure to get ssh host keys	5 months ago
ssh_stub.go	ipnlocal: log failure to get ssh host keys	5 months ago
ssh_test.go	ipn/ipnlocal: plumb health.Tracker into profileManager constructor	2 months ago
state_test.go	control/controlclient: delete unused Client.Login Oauth2Token field	2 months ago
taildrop.go	ipn/localapi: add support for multipart POST to file-put	3 months ago
web_client.go	all: remove LenIter, use Go 1.22 range-over-int instead	4 months ago
web_client_stub.go	ipn/ipnlocal: add mutex to webClient struct	8 months ago