Document updated on Oct 24, 2022
Sending out logs, metrics, and traces
The Opencensus exporter is a single component that allows you to export data to multiple providers, both open source and privative.
You will be interested in Opencensus when you want to see data in one of its supported exporters. For instance, you might want to send metrics to Prometheus. That would be as easy as adding this snippet in the root level of your krakend.json file:
{
"version": 3,
"extra_config": {
"telemetry/opencensus": {
"exporters": {
"prometheus": {
"port": 9091,
"namespace": "krakend"
}
}
}
}
}
Configuration
The Opencensus needs at least an exporter to work, although multiple exporters can be added in the same configuration. Notice that adding several exporters that push metrics out to multiple systems will affect the performance of the server.
Every exporter has its own configuration and it’s described in its section.
By default, all exporters use a sample_rate=0, meaning that they won’t report anything, but this can be changed by specifying the de configuration:
{
"version": 3,
"extra_config": {
"telemetry/opencensus": {
"sample_rate": 100,
"reporting_period": 0,
"enabled_layers": {
"backend": true,
"router": true,
"pipe": true
},
"exporters": {
"prometheus": {
"port": 9091
}
}
}
}
}
Fields of Telemetry via Opencensus
enabled_layers- Lets you specify what data you want to export. All layers are enabled by default unless you declare this section.
backendboolean- Reports the activity between KrakenD and your servicesDefaults to
false pipeboolean- Reports the activity at the beginning of the proxy layer. It gives a more detailed view of the internals of the pipe between end-users and KrakenD, having into account merging of different backends.Defaults to
false routerboolean- Reports the activity between end-users and KrakenDDefaults to
false
exporters* object- The exporter(s) you would like to enable. See each exporter configuration in its own section.
reporting_periodinteger- The number of seconds passing between reports. If duration is less than or equal to zero, it enables the default behavior of each exporter.Defaults to
0 sample_rateinteger- A number between 0 (no requests at all) and 100 (all requests) representing the percentage of sampled requests you want to send to the exporter. Sampling the 100% of the requests is generally discouraged when the relationship between traffic and dedicated resources is sparse.Defaults to
0
