The New Relic plugin allows you to feed your New Relic account with BizTalk data from AIMS. Data sent to New Relic is message count, message delay, number of errors and number of proactive warnings.
You will need AIMS Enterprise edition to use the plugins.
The connection to New Relic is done by clicking the "gear" icon top right in AIMS, then select "Proactivity" and paste your New Relic license key. You will also need to login to your New Relic account and install the AIMS plugin.