Lessons repeated but not learned from Indonesia? That warning systems are far more than considering sensors and hoping that they work, such as not being vandalised. Instead, warning systems are a long-term social process, often requiring technology. Some publications:
1. "Warning for the 26 December 2004 tsunamis" http://www.ilankelman.org/articles1/kelman2006warning.pdf
2. "Early Warning Systems Defined" https://link.springer.com/chapter/10.1007%2F978-94-017-8598-3_5
3. "Warning systems as social processes for Bangladesh cyclones" https://emeraldinsight.com/doi/full/10.1108/DPM-12-2017-0318
This is not about Indonesia, blaming the disaster management authorities there, or condemning the lack of sensors in this case. Many places around the world act similarly. Instead, it is about changing our collective view of warning systems to be about people, not technology (even when the warning systems frequently can and should use technology).
I wonder what happened to the population of critically endangered Javan rhino in Ujung Kulon NP, which was affected by the tsunami. I am not able to find any information or reports on the affect of the tsunami on this national park and the last 60-70 wild specimens of this iconic species.
Anak Krakatau eruption was considered a threat for the whole population by several specialists, but nothing was done in order to mitigate this risk.