AppDynamics, the provider of an application performance management & monitoring solution that simplifies the management of complex, business-critical apps, has raised $50 million in venture debt—which includes mezzanine term financing and a revolving line of credit—from Silicon Valley Bank. The company is growing quickly, expanding from 150 employees to over 400 in just the past 18 months. It will need to keep up, as several other companies are solidifying their positions in the industry. Rival app monitoring company New Relic just raised $101 million at a $1.52 billion valuation this past April; and Boundary, a similar service, raised $22 million at a $113 million valuation in April as well. AppDynamics, considered to be nearing an IPO, last raised a $50 million Series D round of funding in January 2013, valuing the company at $552 million at the time.