Pipeline Components and Applications

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  6. Monitoring


Enrich app has monitoring built in, to help the pipeline operator.


Statsd is a daemon that aggregates and summarizes application metrics. It receives metrics sent by the application over UDP, and then periodically flushes the aggregated metrics to a pluggable storage backend.

Enrich can periodically emit event-based metrics to a statsd daemon. Here is a string representation of the metrics it sends:

snowplow.enrich.raw:42|c|#tag1:value1 snowplow.enrich.good:30|c|#tag1:value1 snowplow.enrich.bad:12|c|#tag1:value1 snowplow.enrich.latency:123.4|g|#tag1:value1 snowplow.enrich.invalid_enriched:0|c|#tag1:value1
Code language: PHP (php)
  • raw: total number of raw collector payloads received.
  • good: total number of good events successfully enriched.
  • bad: total number of failed events, e.g. due to schema violations, invalid collector payload, or an enrichment failure.
  • latency: time difference between the collector timestamp and time the event is emitted to the output stream
  • invalid_enriched: number of enriched events that were not valid against atomic schema

Note, the count metrics (raw, good, bad and invalid_enriched) refer to the updated count since the previous metric was emitted. A collector payload can carry multiple events, so it is possible for good to be larger than raw.

Statsd monitoring is configured by setting the monitoring.metrics.statsd section in the hocon file:

"monitoring": { "metrics": { "hostname": "localhost" "port": 8125 "tags": { "tag1": "value1" "tag2": "value2" } "prefix": "snowplow.enrich." "period": "10 seconds" } }
Code language: JavaScript (javascript)


Above metrics can also be printed in the logs (with log level info).

To do that, this section needs to appear in the configuration file:

"monitoring": { "metrics": { "stdout": { "period": "1 minute" "prefix": "snowplow.enrich." } } }
Code language: JavaScript (javascript)


Sentry is a popular error monitoring service, which helps developers diagnose and fix problems in an application. Enrich can send an error report to sentry whenever something unexpected happens when trying to enrich an event. The reasons for the error can then be explored in the sentry server’s UI.

Sentry monitoring is configured by setting the monitoring.sentry.dsn key in the hocon file with the url of your sentry server:

"monitoring": { "dsn": "http://sentry.acme.com" }
Code language: JavaScript (javascript)

Cloudwatch (for enrich-kinesis)

It’s possible to send KCL and KPL metrics to Cloudwatch by adding this section to the config file:

"monitoring": { "cloudwatch": true }
Code language: JavaScript (javascript)