I presume you're running the latest version 1.2.2?
Maybe strace will help you understand what's going on:
strace -f -s128 -p <pid-of-node-exporter> 2>strace.out
You can see which files it's trying to access and whether it's getting
permission errors.
FWIW, I just tried running node_exporter as root and normal users, and I
got 3906 and 3900 lines of metrics respectively. The only ones which were
missing were:
# HELP node_rapl_core_joules_total Current RAPL core value in joules
# TYPE node_rapl_core_joules_total counter
node_rapl_core_joules_total{index="0"} 79345.889568
# HELP node_rapl_package_joules_total Current RAPL package value in joules
# TYPE node_rapl_package_joules_total counter
node_rapl_package_joules_total{index="0"} 129630.134976
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