Logs

Output

Scalr agent logs are written to stdout and stderr, which enables them to be captured by standard container runtimes, system supervisors, and log collectors. For log persistence, you must configure a log forwarding mechanism or direct the output to a file.

Log Levels

The agent supports several log levels to provide varying degrees of detail:

• error: For critical events requiring immediate attention.
• warning: For non-critical issues that may need monitoring if they occur frequently.
• info: For high-level operational activity (this is the default level).
• debug: For low-level details useful in troubleshooting.

By default, the Scalr Agent logs at the info level. To include debug logs, enable the SCALR_AGENT_DEBUG option.

Log Format

The log output format is configurable via the SCALR_AGENT_LOG_FORMAT environment variable.

To enable structured logging, set SCALR_AGENT_LOG_FORMAT=json. This will switch the log output to a JSON format, as shown in the example below:

{
   "agent_id": "agent-v0otjddhqsmolv765",
   "agent_name": "default-agent-f73aua4",
   "pool_name": "default-pool",
   "event": "Scalr agent is ready to receive tasks.",
   "level": "info",
   "logger_name": "tacoagent.cmd",
   "timestamp": "2025-07-31 10:00:33.428024",
}