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By default, the machine agent has been configured to monitor 5 volumes. But this value is configurable.
Could you please take a look at the configuration of volumeMonitorConfig section in the $MACHINE_AGENT_HOME/extensions/ServerMonitoring/conf/ServerMonitoring.yml file? It must be looking like:
# maxNumberVolumes specifies the maximum number of volumes that the
# machine agent will monitor.
maxNumberVolumes : 5
# whitelistSelectorRegex specifies the regular expression used to whitelist reported volumes
# by name. A volume with the name matching the regex will always be reported,
# with respect to maxNumberVolumes
whitelistSelectorRegex : ""
This configuration means that the agent will show only 5 volumes by default which you see in your case. You can set a higher value to the
maxNumberVolumes parameter and then restart the machine agent to see the configured no. of volumes in your machine.
PS: Please note that as mentioned under Volume Metrics section at latest doc
There is no maximum value for maxNumberVolumes parameter in volumeMonitorConfig section in the $MACHINE_AGENT_HOME/extensions/ServerMonitoring/conf/ServerMonitoring.yml file.
You can set any value you want.
I hope this helps