Logstash grok divides the log message into segments

Elastic Stack Logstash
1

The message is chopped from the log file and grok fails for few of the events.

The below is chopped one

al:9092/alp.incident.raw/group0/0\\\",\\\"cen://kafka-china-qa-1a-0.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-1.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-2.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092/alp.incident.nonopg/group0/0\\\"]

this is original message from the log file which logstash reads.

["cen://kafka-china-qa-1a-0.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-1.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-2.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092/alp.incident.raw/group0/0","cen://kafka-china-qa-1a-0.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-1.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092,kafka-china-qa-1a-2.kafka-china-qa-1a-headless.china-qa-posdatabus.svc.cluster.local:9092/alp.incident.nonopg/group0/0"]

Any help is greatly appreciated.

2

Are segments divided by the comma or how to divide? Please specify the field names.
How does grok look like? What is a correct message and is this the only grok failed message?