first example: ok, yes, if they offer the DB as a service, that would be bad.
If you run it on a VM it's IMHO your responsibility to make sure your time sensitive database nodes have shared time.
Same for the second example, interesting point for SaaS scenario, although it seems like that could break through normal deviations already.
EDIT: ok, the blog post actually mentions "local clocks in sync with VM instances running on Google Compute Engine", my bad. Not sure what to think about that. In comparison, Amazon recommends running NTP on your VMs and their Linux AMIs come with pool.ntp.org configured as default. </edit>
Third: It's going to figure out some solution (if Google is only one source it's probably going to drop it as faulty), but you probably should not have added a time source that's officially documented to not strictly follow standards. It's not like Google offered a NTP service for years and now suddenly switched how it works.
I guess I underestimate the amount of trust people put into random time sources: practice is probably messier than theory.
If you run it on a VM it's IMHO your responsibility to make sure your time sensitive database nodes have shared time.
Same for the second example, interesting point for SaaS scenario, although it seems like that could break through normal deviations already.
EDIT: ok, the blog post actually mentions "local clocks in sync with VM instances running on Google Compute Engine", my bad. Not sure what to think about that. In comparison, Amazon recommends running NTP on your VMs and their Linux AMIs come with pool.ntp.org configured as default. </edit>
Third: It's going to figure out some solution (if Google is only one source it's probably going to drop it as faulty), but you probably should not have added a time source that's officially documented to not strictly follow standards. It's not like Google offered a NTP service for years and now suddenly switched how it works.
I guess I underestimate the amount of trust people put into random time sources: practice is probably messier than theory.