Age Gauge

The value is the time in seconds since the epoch at which an event has successfully occurred, or 0 to use the current time in epoch seconds. After an Age Gauge has been set, it will continue reporting the number of seconds since the last time recorded, for as long as the SpectatorD process runs. The purpose of this metric type is to enable users to more easily implement the Time Since Last Success alerting pattern.

To set a specific time as the last success:

from spectator.registry import Registry

registry = Registry()
registry.age_gauge("time.sinceLastSuccess").set(1611081000)

last_success = registry.new_id("time.sinceLastSuccess")
registry.age_gauge_with_id(last_success).set(1611081000)

To set now() as the last success:

from spectator.registry import Registry

registry = Registry()
registry.age_gauge("time.sinceLastSuccess").now()

last_success = registry.new_id("time.sinceLastSuccess")
registry.age_gauge_with_id(last_success).now()

By default, a maximum of 1000 Age Gauges are allowed per spectatord process, because there is no mechanism for cleaning them up. This value may be tuned with the --age_gauge_limit flag on the spectatord binary.

Since Age Gauges are long-lived entities that reside in the memory of the SpectatorD process, if you need to delete and re-create them for any reason, then you can use the SpectatorD admin server to accomplish this task. You can delete all Age Gauges or a single Age Gauge.

Example:

curl -X DELETE \
http://localhost:1234/metrics/A

curl -X DELETE \
http://localhost:1234/metrics/A/fooIsTheName,some.tag=val1,some.otherTag=val2