AppSignal - Metrics


  1. https://docs.appsignal.com/metrics/custom.html

collection

https://docs.appsignal.com/appsignal/request-lifecycle.html

After your application serves the request, the transaction is closed and placed into a queue. Depending on your environment (development/production) and the gem version, the thread that was started during the application start sleeps a certain amount of time. Once the sleep is over it processes the queue of transactions and sends it to our AppSignal Push API.

custom metrics are not sent immediately - they must be buffered by agent during some amount of time (most likely 1 minute) and only then are they sent to AppSignal.

metric values are collected during this time frame (~1 minute) and then final value (or values) is sent to AppSignal - it depends on metric type what value is eventually persisted if helper is called multiple times:

for measurement metric both values are persisted - it creates 2 metric fields (COUNT and MEAN) for them accordingly (4 metric fields in all).

display

metric type also determines what values are used for current display time frame in web UI - the same rules apply as when collecting metrics but now these rules apply to persisted values (not the values passed to helpers).

examples