I applied the December Bundle Patch for OEM earlier this week and kicked off a series of agent upgrades.  Then monsters at my repository database.

Bug 19458672 caused the newly upgraded agents to hang and to consume all the CPU cycles on the repository database host.  It happened during the final step of registering each agent with their new release number when executing:

em_policy.handle_type_meta_ver_change ( :1);

The one-off patch  “Patch 19458672: High contention from metaver upgrade callback if default metric keys don’t exist” described the problem and solved the issue when applied.

But it begs the question:  If the monthly Bundle Patches are cumulative, why wasn’t this tremendously disruptive patch included?