Add minutely probes

Add a minutely probes system. This can be used, alongside our metric helpers, to report metrics to AppSignal once per minute.

from appsignal import probes, set_gauge
 
def new_carts(previous_carts=None):
    current_carts = Cart.objects.all().count()
 
    if previous_carts is not None:
      set_gauge("new_carts", current_carts - previous_carts)
 
    return current_carts
 
probes.register("new_carts", new_carts)

The minutely probes system starts by default, but no probes are automatically registered. You can use the enable_minutely_probes configuration option to disable it.

Add CPU count configuration option

Implement CPU count configuration option. Use it to override the auto-detected, cgroups-provided number of CPUs that is used to calculate CPU usage percentages.

To set it, use the the cpu_count configuration option or the APPSIGNAL_CPU_COUNT environment variable.

Fix ASGI events showing up as slow API requests

Fix ASGI events, from Python ASGI applications that have been instrumented with AppSignal, mistakenly showing up in the "Slow API requests" panel.