How to view Grid Control agent "raw" metrics

Sometimes Alerts will not clear properly in OEM, specifically I have seen this happen with regard to invalid objects. In order to find out what is really going on, it is sometimes helpful to look at the actual data that the agent is presenting to oem for debugging. It is simple to do this, as described in Metalink note 276350.1:

First, check whether Metric Browsing is enabled on the agent...the server name below is the server name that you are monitoring - the server where the agent is running, NOT the oem repository server:

http|https://myServer.myDomain:3872/emd/browser/main

If you get a 403 error from this url, then do the following on that server:

$ vi /sysman/config/emd.properties

Then find the line that reads:

# To enable the metric browser, uncomment the following line
# This is a reloadable parameter
#
#enableMetricBrowser=true

...and un-comment this line:

enableMetricBrowser=true

Then reload the agent:

AGENT_HOME>/bin/emctl reload agent

You should now be able to access the URL that returned a 403 previously. It will list all of various metrics that the agent has, so you can see where any issues are. In my case, it was very helpful, because I was getting invalid object warnings, but through sqlplus I could query dba_objects and see that there were no invalids in the schema it was complaining about. It turns out that the agent was viewing BIN$... objects from the recycle bin as invalid. I cleared the recycle bin, and viola! I was able to click the "reevaluate alert" button and clear the alert. problem solved.