Today, at 3h30 PM our service was unvailable for our customers.
All our production service were not available.
After the investigation, we figure out that the problem was caused by an upgraded of Kubernetes of the nodes pool. This upgrade of Kubernetes was made by ours developers. The nodes pool didn't support this upgrade for unknow reason.
To fix the problem, we had to create a new nodes pool.
For future upgrade, we will create a new nodes pool instead of upgrading existing one.
We are deeply sorry for the inconvenience caused.