You are seeing some abnormal behaviour with one of the CA Directory session stores. You are getting alerts from DXSERVER_agent: Metric Path sessionstore - Metric dxCacheUsedBytes Metric Exceeded Danger Threshold 28008 of 8000. This metric is reported by apmia sitemider extension. Normally, this value is very low. The issue started in past few weeks.
Issue has not occurred since the recycle of sitemider services.