Some useful bash scripts.
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ALL_SESSIONS=$(netstat -tnp | grep sshd -c)
SU_SESSIONS=$(ps aux | grep ' [s][u] ' -c)
ROOT_SESSIONS=$(netstat -tnp | grep sshd | grep root -c)
echo "# HELP node_active_sessions active sessions by type."
echo "# TYPE node_active_sessions gauge"
echo "node_active_sessions{type=\"all\"} $ALL_SESSIONS"
echo "node_active_sessions{type=\"su\"} $SU_SESSIONS"
echo "node_active_sessions{type=\"root\"} $ROOT_SESSIONS"