GCP Log Cost Attribution

I have multiple service on a single project, lets say i have 2 GAE (Google App Engine)
The first one is service_a and the second one is service_b. Both service write logs. I've already label both GAE, but it's seems the label is not included the log cost. Is there any way to differentiate the log cost between service_a and service_b?

after wasting my time for few days
i've found alternative solution for this

on default, you will have 2 log storage & 2 log router sink

1. _Default
2. _Required (ignore this)

from my understanding

1. log storage is a storage that will store your log
2. log router sink is a rule that will decided where the log will be stored

on default, your log will be store on _Default log

here the default state on terraform

resource "google_logging_project_bucket_config" "_Default" {
  project        = data.google_project.project.project_id
  location       = "global"
  retention_days = 30
  bucket_id      = "_Default"
  description    = "Default"
}

resource "google_logging_project_sink" "_default" {
  name        = "_Default"
  disabled    = false
  destination = "logging.googleapis.com/projects/my-project/locations/global/buckets/_Default"

  filter = "NOT LOG_ID(\"cloudaudit.googleapis.com/activity\") AND NOT LOG_ID(\"externalaudit.googleapis.com/activity\") AND NOT LOG_ID(\"cloudaudit.googleapis.com/system_event\") AND NOT LOG_ID(\"externalaudit.googleapis.com/system_event\") AND NOT LOG_ID(\"cloudaudit.googleapis.com/access_transparency\") AND NOT LOG_ID(\"externalaudit.googleapis.com/access_transparency\")"


  unique_writer_identity = true
}

So the solution is by create the log storage and log router sink for each your service,
you can look terraform code below (this case, i have 1 GAE and 1 Dataflow)

resource "google_logging_project_bucket_config" "_Default" {
  project        = data.google_project.project.project_id
  location       = "global"
  retention_days = 30
  bucket_id      = "_Default"
  description    = "Default"
}

resource "google_logging_project_bucket_config" "ingestion_dataflow_logging_bucket" {
  project        = data.google_project.project.project_id
  location       = "global"
  retention_days = 30
  bucket_id      = "ingestion_dataflow"
  description    = "ingestion dataflow logging bucket"
}

resource "google_logging_project_bucket_config" "gae_minerva_logging_bucket" {
  project        = data.google_project.project.project_id
  location       = "global"
  retention_days = 30
  bucket_id      = "gae_minerva"
  description    = "gae minerva logging bucket"
}

resource "google_logging_project_sink" "_default" {
  name        = "_Default"
  disabled    = false
  destination = "logging.googleapis.com/projects/my-project/locations/global/buckets/_Default"

  filter = "NOT LOG_ID(\"cloudaudit.googleapis.com/activity\") AND NOT LOG_ID(\"externalaudit.googleapis.com/activity\") AND NOT LOG_ID(\"cloudaudit.googleapis.com/system_event\") AND NOT LOG_ID(\"externalaudit.googleapis.com/system_event\") AND NOT LOG_ID(\"cloudaudit.googleapis.com/access_transparency\") AND NOT LOG_ID(\"externalaudit.googleapis.com/access_transparency\")"

  exclusions {
    name     = "dataflow-ingestion-exclusions"
    disabled = false
    filter   = "resource.type=\"dataflow_step\" AND jsonPayload.worker:\"dataflow_ingestion_worker\""
  }
  exclusions {
    name     = "gae-minerva-exclusions"
    disabled = false
    filter   = "resource.type=\"gae_app\" AND resource.labels.module_id:\"minerva_project\""
  }

  unique_writer_identity = true
}

resource "google_logging_project_sink" "ingestion_dataflow_logging_sink" {
  name        = "ingestion_dataflow"
  disabled    = false
  destination = "logging.googleapis.com/projects/my-project/locations/global/buckets/ingestion_dataflow"

  filter = "resource.type=\"dataflow_step\" AND jsonPayload.worker:\"dataflow_ingestion_worker\""

  unique_writer_identity = true
}

resource "google_logging_project_sink" "gae_minerva_logging_sink" {
  name        = "gae_minerva"
  disabled    = false
  destination = "logging.googleapis.com/projects/my-project/locations/global/buckets/gae_minerva"

  filter                 = "resource.type=\"gae_app\" AND resource.labels.module_id:\"minerva_project\""
  unique_writer_identity = true
}

by creating storage bucket for each services, you can see the log size. therefore you can estimate the log cost for each service

Can you try by exploring this Price Calculator as a workaround. In this Calculator search for cloud Operations product and enter the values it is asking. Here, you should know the volumes of logs data received to a service. By entering these data values , we can know the log cost of each service.

Below is an example given for your reference :

If service A received 100 Gib volume of logs then we need to enter the value as shown in the below screenshot- 1.

Post entering the value and then clicking on estimate we will receive the estimated cost as shown in below screenshot-2.

Similarly we need to check for the Service B. This is just a suggestion for your query

And also As per @JohnHanley comments, if there is no such method. Raise this as a feature request at the Public Issue Tracker report with the description of your issue . This Issue Tracker is a forum for end users to report bugs and request features to improve google cloud products. Product engineering from Google will work on this implementation.