Grafana Unikernel monitoring experiments

Using Influx, Telegraf, etc.

Dynamic adjustments of Log level and Metrics reporting

The create function has a listener_port argument. If this is provided, then on the given port TCP connections to the unikernel are possible. Each connection can transmit a command (as text) to adjust log level and enable or disable metrics sources:

The log level (prefix L) is specified, the same as the command-line argument -l:

• L*:debug all log sources are enabled on the debug level
• Lmonitoring-experiments:error the log source monitoring-experiments is set to the error level
• L*:info,monitoring-experiments:debug all log sources are enabled on the info level, and the log source monitoring-experiments is set to the debug level

The metrics (prefix M) sources can be enabled and disabled based on source name. First, if present, the all command is executed, then specific sources:

• M*:disable,memory:enable,net-solo5:enable disables all metrics sources, and then enables memory and net-solo5
• Mnet-solo5:disable disables the net-solo5 metrics source.

The log levels for the log sources can be inspected:

• l reports the default log level and the log level for all log sources
• l* reports the default log level only
• lmonitoring-experiments,dns reports the log level for monitoring-experiments and dns respectively.

Likewise, metrics status can be similarly inspected:

• m reports the metrics status for all metrics sources
• mmemory,net-solo5 reports the metrics status for memory and net-solo5 respectively.