Even after setting disableInsightsAlerts to True as described in the documentation[1], the alert associated with Insights still streams in alerting section.
The alert triggers after disabling the insights operator as describe in this documentation[2].

[1] https://docs.openshift.com/container-platform/4.12/support/remote_health_monitoring/using-insights-operator.html#disabling-insights-operator-alerts_using-insights-operator
[2] https://docs.openshift.com/container-platform/4.12/support/remote_health_monitoring/opting-out-of-remote-health-reporting.html#insights-operator-new-pull-secret_opting-out-remote-health-reporting

RHOCP 4.12.13

100%

1. Disable insights alerts using documentatio[a]
2. Disable remote health reporting using documentation[b]
3. Wait for 5 mins and check alerts.
4. New new alert named "InsightsDisabled" will be visible

[a] https://docs.openshift.com/container-platform/4.12/support/remote_health_monitoring/using-insights-operator.html#disabling-insights-operator-alerts_using-insights-operator
[b] https://docs.openshift.com/container-platform/4.12/support/remote_health_monitoring/opting-out-of-remote-health-reporting.html#insights-operator-new-pull-secret_opting-out-remote-health-reporting

The alert associated with insights operator gets triggered.

The alert shouldn't trigger after setting "disableInsightsAlerts" parameter as mentioned in the documentation.