...Harvest Midstream I, L.P.'s (HMI) ratings reflect a diversified asset portfolio, relatively stable cash flows and an affiliate relationship. These strengths are offset by higher leverage, reliance on acquisitions for growth, volumetric risk, increasing commodity price exposure and concentrated counterparty exposure. HMI currently has limited rating headroom, as Fitch Ratings expects its leverage to approach the high end of the rating sensitivity range and remain elevated in the near term....