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[202012][fast-reboot] Remove FLEX_COUNTER_TABLE from config_db.json b…
…efore reboot (sonic-net#1774) Remove FLEX_COUNTER_TABLE from config_db.json before fast-reboot to allow delaying FLEX counter polling after fast-reboot. Delaying FLEX counter polling is important to keep fastboot dataplane downtime under 30s. In the going down path, add a step to modify config_db.json - remove the key:value for FLEX_COUNTER_TABLE table. Repro'd the issue in the latest 202012 image. With the fix, the counter polling is delayed and downtime is back to normal.
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