The normal size of a day's Metricbeat data is about 1.8GB. However, yesterday's docs count dropped in half.
Also, the Docker panel in Kibana Infra says " There is no data to display." after 3 PM yesterday. So I guess the Docker module stopped working.
My metricbeat runs on Kubernetes, following the guide here(https://www.elastic.co/guide/en/beats/metricbeat/current/running-on-kubernetes.html). All the Elastic Stack aligned at 6.6.0. I tried to restart the daemonset( the daemon set collects kubernetes and docker data, see the YAML file in the link), but there is still no docker data after restarting.
Metricbeat is working from the events rate in monitoring(the blank is due to restart):
So it looks like the other module is working but the docker module failed.
What can I do to solve the problem?