Coradiant Inc., a Poway, Calif.-based provider of real-user monitoring equipment for data center applications, has raised $15 million in Series E funding. Mesirow Financial Private Equity led the deal, and was joined by return backers Desjardins, DCM, GrandBanks Capital and Miramar Venture Partners. Coradiant has raised around $55 million in total VC funding since 2000. www.coradiant.com