Not sure about Signoz and PagerDuty, but there are plenty freemium services like UpTimeRobot that work fine for basics.
And then something like AWS CloudWatch has a lot more advanced options about how to treat missing data.
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitori...
With a lot of knobs to tune around what intervals you need and what counts as 'down', which you'll want to think about pretty carefully given what you need.
Not sure about Signoz and PagerDuty, but there are plenty freemium services like UpTimeRobot that work fine for basics.
And then something like AWS CloudWatch has a lot more advanced options about how to treat missing data.
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitori...
With a lot of knobs to tune around what intervals you need and what counts as 'down', which you'll want to think about pretty carefully given what you need.