As the Product Manager for Google Docs, facing a 10% decrease in the 'Open' metrics, what steps would you take to investigate and address this decline?

My first step would be to gather more context. I'd clarify the definition of 'Open metrics' and understand the timeframe and nature of the 10% decline – is it sudden or gradual? I would then segment the data to identify if the decline is concentrated in specific geographies, customer segments (consumer vs. enterprise), or platforms (web vs. mobile). Concurrently, I'd investigate recent product releases for potential bugs or regressions and review user feedback channels and bug reports for any emerging issues. Finally, I'd analyze related metrics to see if the decline in opens correlates with drops in other engagement indicators.