That's why I explicitly chose every 10 minutes.
There are situations like that.
I have seen CGIs where usage started very slow and then gre t the point of friendly DDoS, and it's not fun because the CGI is usually built deep into the architecture by that point.
Also, sensors was the first thing that came to mine.
Also some sensors read very fast, like in Linux "sensors -f" returns the CPU temperatures.
Each CGI request has to create a new process, that can easily mean entire seconds of CPU per request.
A few sensors sending information from time to time will quickly turn into a massive resource hog. Having used CGI extensively, one of the biggest caveats is resource exhaustion and the ensuing DDoS.