7Targets leadsv3 NullPointerException Alarm Investigation
OpsRabbit investigated a production CloudWatch alarm for repeated NullPointerException events in the leadsv3 service, validated the alert path, correlated it with prior stack trace evidence, and narrowed the likely failure to a recurring background usage summary job.
Screenshots
Value
The investigation converted a generic NullPointerException alarm into an actionable diagnosis by tying the metric spike to a likely code location and proposing a concrete defensive fix pattern the engineering team can apply immediately.
Story detail
OpsRabbit traced a NullPointerException alarm in leadsv3 to a recurring issue in UsageSummary.java:809 (background job). Not user-facing. Fix: add null checks, skip safely with logging, and add unit tests.
What was done
Verified the CloudWatch alarm semantics and confirmed the 03:59 UTC event represented two matching NullPointerException log entries in one five-minute period.
Correlated the alert with prior retained leadsv3 log evidence pointing to `UsageSummary.sendDailyUsageSummary(UsageSummary.java:809)`.
Produced an evidence-based RCA, operator action plan, and likely Java null-guard fix pattern for the suspected failure path.