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James Tucker 0f3b2e7b86 util/expvarx: add a time and concurrency limiting expvar.Func wrapper ... expvarx.SafeFunc wraps an expvar.Func with a time limit. On reaching the time limit, calls to Value return nil, and no new concurrent calls to the underlying expvar.Func will be started until the call completes. Updates tailscale/corp#16999 Signed-off-by: James Tucker <james@tailscale.com>		2 years ago
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expvarx.go	util/expvarx: add a time and concurrency limiting expvar.Func wrapper	2 years ago
expvarx_test.go	util/expvarx: add a time and concurrency limiting expvar.Func wrapper	2 years ago