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health: make it omittable

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And stop depending on expvar and usermetrics when disabled,
in prep to removing all the expvar/metrics/tsweb stuff.

Updates #12614

Change-Id: I35d2479ddd1d39b615bab32b1fa940ae8cbf9b11
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-10-03 11:05:37 -07:00
committed by Brad Fitzpatrick
parent 9c3aec58ba
commit 447cbdd1d0
17 changed files with 369 additions and 230 deletions
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2
wgengine/magicsock/magicsock.go
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@@ -1710,7 +1710,7 @@ func (c *Conn) mkReceiveFunc(ruc *RebindingUDPConn, healthItem *health.ReceiveFu
var epCache epAddrEndpointCache
return func(buffs [][]byte, sizes []int, eps []conn.Endpoint) (_ int, retErr error) {
if healthItem != nil {
if buildfeatures.HasHealth && healthItem != nil {
healthItem.Enter()
defer healthItem.Exit()
defer func() {