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# Device Event Log
This directory contains code for logging device and system events.
## Usage
Use device event log macros to record events without contributing to noise in
the chrome log.
* Events are stored in a circular buffer (current limit is 4000).
* Events can be viewed at chrome://device-log. Events can be filtered by type
and level.
* Events show up in **feedback reports** under `device_event_log`.
* Network events are separated out into a `network_event_log` section.
* **ERROR** events will also be logged to the main chrome log.
* All events can be logged to the main chrome log using vlog:
`--vmodule=device_event_log*=1`
The events can also be queried for viewing in other informational pages, e.g:
```
device_event_log::GetAsString(device_event_log::OLDEST_FIRST, "json",
"bluetooth", device_event_log::LOG_LEVEL_DEBUG,
1000);
```
## Examples
Typical usage:
```NET_LOG(EVENT) << "NetworkState Changed " << name << ": " << state;```
```POWER_LOG(USER) << "Suspend requested";```
```POWER_LOG(DEBUG) << "Sending suspend request to dbus object: " << path;```
```BLUETOOTH_LOG(ERROR) << "Unrecognized DBus error " << error_name;```
Advanced usage:
```
device_event_log::LogLevel log_level =
SuppressError(dbus_error_message) ? device_event_log::LOG_LEVEL_DEBUG
: device_event_log::LOG_LEVEL_ERROR;
DEVICE_LOG(device_event_log::LOG_TYPE_NETWORK, log_level) << detail;
```
```
USB_PLOG(DEBUG) << "Failed to set configuration " << configuration_value;
```
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