Lasso

Features:

• Add copy truncate log rotation support. This is enabled by default. It does not support copy truncate with compression unless the delaycompress option is used. This feature can be disabled by setting enable_copy_truncate_log_rotation_support to false.

Improvements:

• Add new tcp_request_parser and tcp_message_delimiter config option. Valid values for tcp_request_parser include default and batch. New TCP recv batch oriented request parser is much more efficient than the default one and should be a preferred choice in most situations. For backward compatibility reasons, the default parser hasn't been changed yet.
• shell_monitor now outputs two additional metrics during each sample gather interval - duration and exit_code. First one represents how many seconds it took to execute the shell command / script and the second one represents that script exit (status).

Misc:

• On startup and when parsing a config file, agent now emits a warning if the config file is readable by others.
• Add the config option enable_worker_process_metrics_gather to enable 'linux_process_metrics' monitor for each multiprocess worker.
• Each session, which runs in a separate process, periodically writes its stats in the log file. The interval between writes can be changed by using the default_worker_session_status_message_interval
• Rename some of the configuration parameters: use_miltiprocess_copying_workers to use_multiprocess_workers, default_workers_per_api_key to default_sessions_per_api_key. Previous option names are preserved for the backward compatibility but they are marked as deprecated. NOTE: The appropriate environment variable names are changed too.
• Update docker monitor so we don't log some non-fatal errors under warning log level when consuming logs using Docker API.
• Add support for compression_type: none config option which completely disables compression for outgoing requests. Right now one of the main bottle necks in the high volume scenarios in the agent is compression operation. Disabling it can, in some scenarios, lead to large increase to the overall throughput (up to 2x). Disabling the compression will in most cases result in larger data egress traffic which may incur additional charges on your infrastructure provider so this option should never be set to none unless explicitly advised by the technical support.
• Linux system metrics monitor has been updated to also ignore /var/lib/docker/* and /snap/* mount points by default. Capturing metrics for those mount points usually offers no additional insight to the end user. For information on how to change the ignore list via configuration option, please see RELEASE_NOTES.
• The agent install bash script now adds the Scalyr repositories directly without installing the scalyr-repo packages. This also eliminates errors caused by re-acquiring the package manager's lock file during the pre/post install/uninstall scripts. The issue occurred in both apt and rpm package managers.

Security fixes and improvements:

• Agent installation artifacts have been updated so the default agent.json file which is bundled with the agent is not readable by "other" system users by default anymore. For more context, details and impact, please see RELEASE_NOTES.