tl;dr:(1) 82% indicated that they've experienced burnout in last 6-8 months. (2) 73% said burnout is negatively impacting productivity or personal life. (3) Increased workload and poor work culture are the main reasons. (4) 77% indicated that management is not aware or not taking steps to help. (5) 78% of the developers said they are planning to switch job within 12 months.
tl;dr:Despite a small sample size, the survey is telling on the impact tech debt has on retention - 50% of developers are likely or very likely to leave their jobs because of debt.