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This page discusses metrics used to monitor data usage rates from your Cloud Storage buckets, as well as how to request additional egress bandwidth for different quotas if you need more than the default quota.
For instructions on accessing monitoring data in Cloud Storage, see Access monitoring data.
IntroductionCloud Storage provides bandwidth monitoring for you to track bandwidth usage from your project's buckets to other Google Cloud services. Bandwidth monitoring is aggregated by region and tracks usage for the last 6 weeks.
Before monitoring bandwidth usage, review the following terms:
Egress bandwidth refers to the rate at which data is retrieved from your buckets in the course of completing requests made to Cloud Storage.
Google egress bandwidth refers to data retrieved from your buckets that is destined for other Google services, such as Compute Engine.
Internet egress bandwidth refers to data retrieved from your buckets that is served to the Internet, such as data downloaded directly to your local computer or data retrieved by Cloud CDN for serving to the Internet.
Network egress refers to the rate at which data is sent over the network from your buckets to requesters.
In normal operation, egress bandwidth and network egress are typically about the same; however, in some cases egress bandwidth can be meaningfully greater than network egress. Broken connections, cancelled requests, and partial requests are cases where the data retrieved can be greater than the data that's ultimately sent.
Bandwidth monitoring metricsThe following bandwidth usage data is available for monitoring:
Google egress bandwidth per second per region: monitors Google egress bandwidth usage for buckets in your project that are located in regions.
Dual-region Google egress bandwidth per second per region per dual-region location: monitors Google egress bandwidth usage for buckets in your project that are located in dual-regions.
Multi-region Google egress bandwidth per second per region: monitors Google egress bandwidth usage for buckets in your project that are located in multi-regions.
Internet egress bandwidth per second per region: monitors Internet egress bandwidth usage for buckets in your project that are located in regions.
Dual-region internet egress bandwidth per second per region per dual-region location: monitors Internet egress bandwidth usage for buckets in your project that are located in dual-regions.
Multi-region internet egress bandwidth per second per region: monitors Internet egress bandwidth usage for buckets in your project that are located in multi-regions.
You can use Monitoring alerting policies to inform you when metrics such as storage.googleapis.com/google_egress_bandwidth, storage.googleapis.com/dualregion_google_egress_bandwidth, and storage.googleapis.com/multiregion_google_egress_bandwidth approach a quota limit.
For an overview of Monitoring alerts, see Introduction to alerting.
To get started with Monitoring alerts using the Google Cloud console, see Create metric-based alert policies.
For examples of Monitoring alerts, see Chart and monitor quota metrics.
In addition to Cloud Storage bandwidth monitoring, you can use the network/sent_bytes_count metric to measure Cloud Storage network egress. This is useful for approximating bandwidth usage for specific buckets, because bandwidth monitoring tracks bandwidth usage by location and project.
When using this networking metric, keep in mind the following:
network/sent_bytes_count uses bytes in its measurements, whereas typical networking metrics often use bits. For example, a 1 GiBps measurement for network/sent_bytes_count is equivalent to 8 Gibps.
network/sent_bytes_count tracks all the traffic sent over the network, not only egress to co-located Google Cloud services. As such, network/sent_bytes_count is typically greater than bandwidth usage.
network/sent_bytes_count can be less than bandwidth usage due to events such as broken connections, cancelled requests, and partial requests.network/sent_bytes_count metrics are sampled every 60 seconds. If the traffic is spiky, it's possible that requests are throttled for a short period of time even though the average egress over 60 seconds is below the limit.
The following instructions apply when requesting egress bandwidth of up to 1 Tbps for Cloud Storage buckets:
Make sure you have enabled the Cloud Storage service storage.googleapis.com.
In the Google Cloud console, go to the IAM Quotas & System Limits page.
In the Filter search bar, select the Metric property, then search for the metric for which you are requesting an increase:
Use storage.googleapis.com/google_egress_bandwidth to increase Google egress for your buckets located in regions.
Use storage.googleapis.com/dualregion_google_egress_bandwidth to increase Google egress for your buckets located in dual-regions.
Use storage.googleapis.com/multiregion_google_egress_bandwidth to increase Google egress for your buckets located in multi-regions.
Use storage.googleapis.com/internet_egress_bandwidth to increase Internet egress for your buckets located in regions.
Use storage.googleapis.com/dualregion_internet_egress_bandwidth to increase Internet egress for your buckets located in dual-regions.
Use storage.googleapis.com/multiregion_internet_egress_bandwidth to increase Internet egress for your buckets located in multi-regions.
In the list of results, toggle the checkbox for the locations where you want to increase egress bandwidth. For the storage.googleapis.com/dualregion_google_egress_bandwidth and storage.googleapis.com/dualregion_internet_egress_bandwidth metrics, there must be non-zero historical usage of the metric before you can request an increase.
Click Edit Quotas.
Enter your requested quota and business justification.
Click Submit Request.
For bandwidth requirements greater than 1 Tbps for egress from buckets in regions and dual-regions, contact your Technical Account Manager or Google representative. Increase requests greater than 1 Tbps for egress from buckets in multi-regions are not supported.
Important: Granting and continuation of bandwidth quota increases is dependent on your project's history. For example, a project might have an existing bandwidth quota increase reduced or rescinded if the project is not in good standing.For more information, see View and manage quotas.
What's nextExcept as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
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