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health: add Tracker type, in prep for removing global variables

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This moves most of the health package global variables to a new
`health.Tracker` type.

But then rather than plumbing the Tracker in tsd.System everywhere,
this only goes halfway and makes one new global Tracker
(`health.Global`) that all the existing callers now use.

A future change will eliminate that global.

Updates #11874
Updates #4136

Change-Id: I6ee27e0b2e35f68cb38fecdb3b2dc4c3f2e09d68
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-04-25 13:24:49 -07:00
committed by Brad Fitzpatrick
parent d5fc52a0f5
commit ebc552d2e0
17 changed files with 268 additions and 256 deletions
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net/dns/direct_linux.go
+1 -1
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@@ -58,7 +58,7 @@ func (m *directManager) runFileWatcher() {
}
}
var warnTrample = health.NewWarnable()
var warnTrample = health.Global.NewWarnable()
// checkForFileTrample checks whether /etc/resolv.conf has been trampled
// by another program on the system. (e.g. a DHCP client)