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firebasegoogle-cloud-functionsstackdriver

Could Functions for Firebase invocations displayed in Stackdriver

I'm using Firebase with Cloud Functions on the Blaze plan, and I would like to get an overview of how many of the 2 million free monthly invocations I'm using. After that (that's another story though) I would like to make the same overview for the other price points that Firebase is billing for, such as GB-seconds, CPU-seconds, and Network Outbound usage. I can't see these metrics in the firebase console, so my approach is to use the Google Cloud Console and Stackdriver.

Function Invocations in Firebase

Function Invocations in Firebase console

Function Executions in Stackdriver

Function Executions in Stackdriver

As it's seen on the two graphs, they clearly have the same shape, but the scales are different. The Firebase graph appears to have 3-4-times larger magnitudes that the Stackdriver graph.

Questions:

  • How come the two graph doesn't match each other?
  • Which one am I being billed for?

Here is how I've configured the Stackdriver chart:

Cloud functions executions sum chart in stackdriver

Solution

  • So I asked the Firebase Support Team as Doug proposed.

    Here's what they replied:

    I just got an update from our engineers.

    They're hinting that the difference might come from the aligner being count and not sum, which is what the Firebase Console uses. With this, could you try changing it and see if the values change?

    Additionally, the console is pulling the data from Stackdriver, so the source of the data should be the same. You should also be billed based on the Stackdriver values. If there's still a discrepancy, please let me know and provide the updated screenshots so I can investigate further.

    Afterwards I changed the aligner to be sum instead of count, which resultet in a chart with roughly the same scale as the Firebase graph.

    So to answer my own questions:

    How come the two graph doesn't match each other?

    The should! The aligner in the Stackdriver chart must the set to sum to reflect the Firebase graph.

    Which one am I being billed for?

    Both! The data in Firebase originates from Stackdriver, so the graphs should match. If they don't It's likely an issue with the Stackdriver chart settings, and Firebase must be the true value.