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A flap counter is incremented when the tunnel transitions from an 'up' to a
'down' state at least 3 times (which means it has also transitioned to an 'up'
state at least twice) within a window of 24 hours. We'll refer to this as the hold
timer window. Note, so if a tunnel flaps multiple times, say, within 10 mins, that
would trigger a tunnel flap alert. If at the end of the hold timer window the
tunnel is down, then AIOps generates the Tunnel Flapping Incident.
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