Tapir & Jordan, For what it's worth, I've notice the same issue. I spoke with billing in the beginning of April, but at the time they weren't aware of the issue, and since it was only a few dollars I didn't pursue it further. If your interesting in investigating, here is some information that may be useful.
- The issue seems to have started on March 6th - For me, it affected 3 low traffic apps (services). - The apps had previously managed with one instance, and had never or very rarely gone over the 28hrs free quota - No recent setting or code changes. Months or years since last updated - All apps where using the Go runtime May be related: - There was another billing issue that affect 2 of the 3 around the same time. The issue involved instance hours being tracked incorrectly (attributed to the wrong day). Billing proactively notified me, via email, and issued a refund for *that* issue. According to billing *that* issue was isolated to one day, but I saw uncharacteristically high quota usage for multiple days that month. - There is a UI bug in the quota table view where quota is reported as $0 daily while still incurring charges for the day (report to billing). I suspect the issue is still ongoing. I made changes to 2 of the 3 to eliminate instance usage, but the third still seems to be requiring increased instance. Since the scheduler behavior is somewhat opaque it's difficult to determine if this is a scheduler issue or caused by increased traffic, however. Sorry if this isn't the correct place to post this, I just wanted to give you an additional datapoint in case it's helpful. On Tuesday, May 1, 2018 at 11:04:04 AM UTC-5, Jordan (Cloud Platform Support) wrote: > > You should investigate how many instances each of your applications used > in March and compare that with the amount in April. If you changed your > applications' scaling settings it would have directly affected instance > count, and in turn the amount of instance hours you use. > > It is also recommended to make sure you are stopping previous versions of > your applications in the Cloud Console > <https://console.cloud.google.com/appengine/versions>, as older versions > can still be serving with instances. > > - Note that Google Groups is reserved for general product discussions and > not for technical support. It is recommended to open a free Billing > Support case > <https://support.google.com/cloud/contact/cloud_platform_billing> for any > billing related inquiries. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/f6a213cd-52d2-4af8-bd0c-3488405fca26%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.