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The upload-client-metrics handler called metricCapture without checking if it was nil or if the metrics slice was empty. Most tests pass nil for metricCapture, so if a metrics upload races in during the test, it panics. Fixes #19252 Change-Id: Ib904d1fe6779067dc2a153d1680b8f50cba9c773 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>