This code rumps up your application given the name of the web app, resource group, the duration of the traffic-routing and the percentage of traffic you want to route every time

Azure Web App Traffic Routing with az cli

#!/bin/bash
WEBAPP=$1
RESOURCEGROUP=$2
MINUTES=$3
RAMPUPPERCENTAGE=$4
regularExpression='^[0-9]+$'
if ! ([[ $MINUTES =~ $regularExpression ]] && [[ $RAMPUPPERCENTAGE =~ $regularExpression ]]);
then
   echo "error: Not a number" >&2;
else
 secsToRumpUp=$(awk "BEGIN {print ($RAMPUPPERCENTAGE/100)*($MINUTES*60)}")
 rumpup=$RAMPUPPERCENTAGE;
 incremental=$(awk "BEGIN {print ($MINUTES*60)/$secsToRumpUp}")
 echo "Your webapp $WEBAPP in the resource group $RESOURCEGROUP will be traffic-routed in the next $MINUTES minutes every $secsToRumpUp secs a $RAMPUPPERCENTAGE %";
 for (( c=0; c<$incremental; c++ ))
 do      
   echo "Incrementing staging slot to $rumpup %";   
   az webapp traffic-routing set --distribution staging=$rumpup --name $WEBAPP --resource-group $RESOURCEGROUP
   sleep "$secsToRumpUp"
   let "rumpup += RAMPUPPERCENTAGE";
 done
 echo "Rolling back traffic-routing..."
 az webapp traffic-routing clear --name $WEBAPP --resource-group $RESOURCEGROUP
 echo "Swapping $WEBAPP"
 az webapp deployment slot swap  -g $RESOURCEGROUP -n $WEBAPP --slot staging --target-slot production
fi