Sorry, haven't been working on this for a few days. However, the problem has now been solved!
It turned out the dev. SH kept writing to the itsi_summary index. ITSI is installed and the services are defined, but the inputs are not all in place. The result was two log entries a minute, one with the right service health score and one constantly at zero, causing the health score to be incorrectly calculated.
Anyway, thanks for your input, skoelpin! Now I know more about how to troubleshoot ITSI issues : )
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