Quotas and limits

This page provides details on the limits that apply to using Cloud Logging.

Logging usage limits

Category	Maximum value
Size of a log entry	256 KB^1
Length of a log entry label key	512 B^2
Length of a log entry label value	64 KB^2
Number of export sinks	200 per Cloud project
Number of exclusion queries	50 per sink
Number of logs buckets	10 per Cloud project
Number of logs views	10 per bucket

¹ This approximate limit is based on internal data sizes, not the actual REST API request size.

² Cloud Logging truncates oversized label keys and values when their associated log entry is written.

Logging API quotas and limits

Category	Maximum value
API usage	To view your quotas, go to the API dashboard. Click an API and select Quotas.
Lifetime of API page tokens	24 hours
Number of open live-tailing sessions per Cloud project	10
Number of live-tailing entries returned per minute	60,000
Size of an entries.write request	10 MB
Number of entries.write API calls	120,000 per minute, per Cloud project^1
Number of entries.list API calls	1 per second, per Cloud project
Number of Cloud projects or other resource names in a single entries.list API call	100

¹ Using log exclusions doesn't reduce this number because logs are excluded after the entries.write call is made.

Requesting more Cloud Logging API quota

You can request higher Logging API limits using the Google Cloud Console:

1. In the Quotas page, use the checkboxes to select Cloud Logging API, then click EDIT QUOTAS.

   Billing must be enabled on the project in order to click the checkboxes.

2. In the Edit Quotas panel, complete the form with your Name, Email , and Phone details, then click Next.

3. In the Edit Quotas panel, select the service to expand the view, then edit the quotas in that service to your requested limit. Click Done.

4. Click Submit request.

The other limits described on this page are fixed.

For more information, go to Working with quotas.

Logs-based metrics

The following limits apply to your usage of user-defined logs-based metrics.

Category	Maximum value
Number of labels per metric	10
Length of label value	1,024 B
Length of label description	800 B
Length of metric descriptors	8,000 B
Number of metric descriptors per Cloud project	500
Number of active time series^1 per metric	30,000
Histogram buckets per custom distribution metric	200

¹A time series is active if you have written data points to it within the last 24 hours.

Logs retention periods

Note: Effective July 15, 2021, storage costs will apply to logs data retained longer than 30 days. For pricing, see the Cloud Logging pricing summary . Currently, charges for retaining logs past 30 days are not enforced.

Cloud Logging retention periods apply to log buckets, regardless of which types of logs are included in the bucket or whether they were copied from another location. The retention information is as follows:

Log bucket	Default retention period	Custom retention
_Required	400 days	Not configurable
_Default	30 days	Configurable
User-defined	30 days	Configurable

For the _Default and user-defined log buckets, you can configure Cloud Logging to retain your logs between 1 day and 3650 days. For information on setting retention rules, see Configuring custom retention.