I found the solution (applied to rhel 7.3)
Just copy common.sh from /usr/share/os-prober/ to /opt/splunkforwarder/etc/apps/Function1_WLS_nix_performance_TA/bin/:
cp /usr/share/os-prober/common.sh /opt/splunkforwarder/etc/apps/Function1_WLS_nix_performance_TA/bin/common.sh
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