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Which command is used to enable logging at the debug log level of Cilium agents7
cilium config set debug true follows the supported Cilium CLI configuration syntax and sets the debug configuration key to true. The cilium config set command accepts a key/value pair and, by default, restarts the Cilium pods so that the changed configuration is applied. The Cilium configuration documentation defines debug as the setting that enables full debug mode. This increases agent logging verbosity and causes eBPF programs to emit additional visibility events for diagnostic use.
Options A, B, and D do not match documented Cilium CLI command structures. There is no cilium log level --set=debug command in the Cilium CLI hierarchy, and neither cilium logging.level=debug nor cilium logging debug is valid configuration syntax. A Helm-managed installation may also enable debugging through the chart value debug.enabled=true, but that does not make any of the alternative commands correct.
Debug mode should be enabled deliberately because it increases log volume and may generate additional datapath visibility information. After troubleshooting, operators should normally restore the previous setting to avoid unnecessary operational overhead.
The supplied answer key incorrectly identifies B. The verified answer is C.
Official references
Cilium configuration; Cilium CLI `config set`; Helm values.
Study Guide topic: Installation and Configuration.