/start to a ping URL and use it to signal when a job starts.
After receiving a start signal, Healthchecks.io will show the check as "Started."
It will store the "start" events and display the job execution times. Healthchecks.io
calculates the job execution times as the time gaps between adjacent "start" and
Healthchecks.io applies an additional alerting rule for jobs that use the
If a job sends a "start" signal, but then does not send a "success" signal within its configured grace time, Healthchecks.io will assume the job has failed. It will mark the job as "down" and send out alerts.
Below is a code example in Python:
import requests URL = "https://hc-ping.com/your-uuid-here" # "/start" kicks off a timer: if the job takes longer than # the configured grace time, the check will be marked as "down" try: requests.get(URL + "/start", timeout=5) except requests.exceptions.RequestException: # If the network request fails for any reason, we don't want # it to prevent the main job from running pass # TODO: run the job here fib = lambda n: n if n < 2 else fib(n - 1) + fib(n - 2) print("F(42) = %d" % fib(42)) # Signal success: requests.get(URL)
When Healthchecks.io receives a "start" signal followed by a regular ping or a "fail" signal, and the two events are less than 24 hours apart, you will see the time delta displayed in the list of checks. If the two events are more than 24 hours apart, they are assumed to be unrelated, and the time delta is not displayed.
You can also see durations of the previous runs when viewing an individual check: