Log Collection: strace, lsof, tcpdump, pcap filter.
Documentation: plantuml.
GDB: breakpoint, catchpoint, watchpoint, tracepoint, process memory, remote debug, symbol table, pretty printer, debug info.
Linux Kernel: kernel module, character device
Protocols: arp, ip routing, dhcp, tipc, virtual ip, drbd, nfs, ldap, diameter.
Adminstration: systemd, fdisk, firewall, kvm.
Network Interfaces: veth, bridge, bond, dummy.
OpenSAF: build install, single-node cluster, two-node cluster, imm, log, smf, sa-aware application, non-sa-aware application, healthcheck, error detection.