(Bloomberg) — Alphabet Inc. reported revenue from the key holiday quarter that missed Wall Street estimates, suggesting the company’s Google advertising business is struggling to maintain growth in the face of rising competition.Revenue, excluding payments to partners, was $37.6 billion in the fourth quarter, less than analysts’ projections of $38.4 billion, according to data compiled by Bloomberg. Ad revenue in the quarter rose 17%, slower than the 20% year-over-year growth from in the same quarter a year earlier.Shares fell about 4% in after-market trading. The stock jumped about 16% in the past three months, hitting a record late last month. […]