What type of logs provide only error entries and only exist for some components?

Error logs are specifically designed to capture and record entries related to error events that occur within a system or application. These logs focus solely on incidents that result in failures or issues, making them an essential tool for troubleshooting and diagnosing problems. By containing only error entries, they allow engineers and system administrators to quickly identify and address critical issues without sifting through unrelated information.

In the context of various types of logs, error logs are distinct from others like debug or trace logs that track more detailed operation information or provide comprehensive visibility into the system's functioning. Console logs can also contain a broad range of information, including warnings and status messages, rather than being strictly limited to error entries. This specificity of content makes error logs invaluable for maintaining system integrity and ensuring timely responses to potential failures.