fluentd pods cannot be scraped by cluster monitoring after upgrade and node failure

Issue

• OCP console alerting screen shows all fluentd pods cannot be scraped.
• fluentd target is showing down in Prometheus UI.error as below:

"Get \"https://10.x.x.x:00000/metrics\": dial tcp 10.x.x.x:00000: connect: connection refused"

• fluentd metric not available and alerts are firing as the target is down as shown below, whereas expected behaviour is the fluentd pod metric be able to scrape by Prometheus.

fluentd pod are running 

fluentd-2dbd7                                   1/1     Running     0          
fluentd-8rtxj                                   1/1     Running     0          
fluentd-bn9s5                                   1/1     Running     0          
fluentd-fxhsd                                   1/1     Running     0          
fluentd-kjn29                                   1/1     Running     0          
fluentd-x8cz6                                   1/1     Running     0