DII Acquisition unit Heartbeat overdue by: xxx seconds

Applies to

• Data Infrastructure Insights(DII)
• Storage Workload Security(SWS) v1.782.0
• Acquisition unit and SWS agent are running on the same Linux host

Issue

• Acquisition unit AU-host at IP address AU-host-IP. Heartbeat overdue by: 774 seconds reports frquently.
• The AU host became unresponsive when accessed remotely.
• acq.log raise the following error indicates Out of Memory risk because memory utilization outside AU reaches 82.5%:

 2026-07-01 19:59:21,924  INFO [DSM-pool-3-thread-2] com.onaro.sanscreen.acquisition.framework.datasource.BaseDataSource (BaseDataSource.java:447) - [foundation] iris-eqosaka1 - Started acquisition
 2026-07-01 19:59:22,056  INFO [DSM-pool-3-thread-2/iris-eqosaka1 [foundation] [ 93 ] ] com.onaro.sanscreen.acquisition.framework.datasource.AuditSession (AuditSession.java:75) - Create datasource audit 505304 for  datasource name: datastore-01 package: foundation datasource Id: 1
 2026-07-01 19:59:22,056  INFO [DSM-pool-3-thread-2/datastore-01 [foundation] [ 93 ] ] com.onaro.sanscreen.acquisition.framework.datasource.BaseDataSource (BaseDataSource.java:604) - Poll begin for package foundation . Switching classloader and running poll. ClassLoaderHandoff
 2026-07-01 19:59:40,628  WARN [HB-MetricsCollector] com.onaro.sanscreen.acquisition.util.AcqMetricService (AcqMetricService.java:1309) - External OOM Risk Level: Critical - NonAU: 82.50204158552673%, Swap: 15.506715506715507%, MemAvailable: 673MB
 ...
 2026-07-02 14:08:43,284 ERROR [ATM-Acq unit heart rate] com.onaro.sanscreen.acquisition.framework.mgmt.ServiceManager (ServiceManager.java:763) - Service Manager - Acquisition Unit Manager reported an error: Failed to renew lease for acquisition unit AU-host
 RequestException{message=Error executing POST request to /rest/v1/au/hb/ab56c305-a8f3-42a5-b1d1-2dc77795a214?reqId=45fa21db-8922-4232-8e4c-132073ac1d88., statusCode=-1, errorCode=null}

• The SWS host is experiencing memory pressure, with only 2% of total memory remaining available, indicating a high risk of memory exhaustion.

# cat /proc/meminfo
 MemTotal:       32602684 kB
 MemFree:          362360 kB
 MemAvailable:     670524 kB
 Buffers:               0 kB
 Cached:         16181016 kB
 SwapCached:        47692 kB
 Active:          3783356 kB
 Inactive:       27788856 kB
 Active(anon):    3648916 kB
 Inactive(anon): 27302316 kB