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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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conffile	cmd/tailscaled, ipn/conffile: support ec2 user-data config file	1 month ago
ipnauth	go.mod, all: move away from inet.af domain seized by Taliban	5 months ago
ipnlocal	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	2 weeks ago
ipnserver	ipn/ipnserver: close a small race in ipnserver, ~simplify code	2 months ago
ipnstate	cmd/tailscale/cli: print node signature in `tailscale lock status`	1 month ago
localapi	ipn/localapi,client/tailscale,cmd/derper: add WhoIs lookup by nodekey, use in derper	2 weeks ago
policy	ipn,tailconfig: clean up unreleased and removed app connector service	8 months ago
store	ipn/store/kubestore, cmd/containerboot: allow overriding client api server URL via ENV (#12115)	1 month ago
backend.go	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	2 weeks ago
conf.go	cmd/k8s-operator,cmd/containerboot,ipn,k8s-operator: turn off stateful filter for egress proxies. (#12075)	2 months ago
doc.go	all: update copyright and license headers	1 year ago
ipn_clone.go	ipn,wgengine: remove vestigial Prefs.AllowSingleHosts	1 month ago
ipn_test.go	all: do not depend on the testing package	1 month ago
ipn_view.go	ipn,wgengine: remove vestigial Prefs.AllowSingleHosts	1 month ago
prefs.go	various: disable stateful filtering by default (#12197)	1 month ago
prefs_test.go	ipn,wgengine: remove vestigial Prefs.AllowSingleHosts	1 month ago
serve.go	serve.go, tsnet.go: Fix "in in" typo (#12279)	1 month ago
serve_test.go	{ipn/serve,cmd/tailscale/cli}: move some shared funcs to ipn	4 months ago
store.go	ipn: add comment about thread-safety to StateStore	4 months ago
store_test.go	ipn: avoid useless no-op WriteState calls	11 months ago