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# bootstat #
The bootstat command records boot events (e.g., `firmware_loaded`,
`boot_complete`) and the relative time at which these events occurred. The
command also aggregates boot event metrics locally and logs the metrics for
analysis.
Usage: bootstat [options]
options include:
-h, --help Show this help
-l, --log Log all metrics to logstorage
-p, --print Dump the boot event records to the console
-r, --record Record the timestamp of a named boot event
--record_boot_reason Record the reason why the device booted
--record_time_since_factory_reset Record the time since the device was reset
## Relative time ##
The timestamp recorded by bootstat is the uptime of the system, i.e., the
number of seconds since the system booted.
## Recording boot events ##
To record the relative time of an event during the boot phase, call `bootstat`
with the `-r` option and the name of the boot event.
$ bootstat -r boot_complete
The relative time at which the command runs is recorded along with the name of
the boot event to be persisted.
## Logging boot events ##
To log the persisted boot events, call `bootstat` with the `-l` option.
$ bootstat -l
bootstat logs all boot events recorded using the `-r` option to the EventLog
using the Tron histogram. These logs may be uploaded by interested parties
for aggregation and analysis of boot time across different devices and
versions.
## Printing boot events ##
To print the set of persisted boot events, call `bootstat` with the `-p` option.
$ bootstat -p
Boot events:
------------
boot_complete 71
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