Once an investment is purchased, it has to be monitored frequently. While monitoring is important, it is also important to avoid too much action with your investments. The hardest part of dividend investing is sitting and doing nothing for years if not decades. The way I monitor investments is the benefit of diversification in your investments is focusing on annual reports and maybe quarterly reports and press releases.
I do this mostly to aide me when deciding to buy a stock or not. I discuss the conditions that would cause me to sell in the next chapter. In the analysis, I look for rising earnings per share, dividend per share, sustainability of distributions and how the business is doing. If you have spent a lot of initial time learning about the company, there would not be much to learn from year to year.