Should you have further questions that have not been answered, this is the section to look at.

Dash0 Backend

Can data be removed from Dash0 after it has been sent?

Dash0 supports infrequent deletion requests, for example, to comply with GDPR.

If you expect frequent or periodic deletion requests, transmit anonymized data to Dash0 (for example, hashed user IDs) instead.

Where are Dash0's backends hosted?

Dash0 is running various backends in several regions.

By default, backends for organizations in Europe are hosted in AWS Europe, and backends for organizations in the US are hosted in AWS US.

For more detailed information, please reach out to your Dash0 contact.

If your infrastructure uses firewalls, WAFs, or IP-based access controls, you may need to allowlist Dash0 IP addresses. Dash0 publishes machine-readable JSON files that list all relevant IP addresses per region:

Ingress IPs — IP addresses used by Dash0's ingestion endpoints. Allowlist these if your systems send telemetry to Dash0.
Egress NAT IPs — IP addresses used when Dash0 sends outbound traffic, for example notification webhooks. Allowlist these if your systems need to accept inbound connections from Dash0.
Synthetic monitoring IPs — IP addresses used by Dash0's synthetic checks. Allowlist these so synthetic checks can reach your endpoints.

Quotas and Limits

This section documents fine-grained limits and quotas for sending data to and querying data from Dash0 that apply to your configuration and telemetry you send to Dash0.

To the best of our knowledge, you should never hit any of these limits with OpenTelemetry automatic instrumentations or any normal observability use-case.

Tracing

Traces

Limit	Value
Maximum number of spans per trace	2,000

Spans

Limit	Value
Maximum character length of a span name	128
Maximum number of attributes per span	32 ¹
Maximum character length for span attribute keys	128
Maximum character length for span attribute values	2,048
Maximum past timestamp for a span to be ingested	6 hours
Maximum future timestamp for a span to be ingested	3 days
Maximum span duration for a span to be queryable	1 day

¹ Resource, scope, span event and span link attributes do not count against this limit.

Span Events

Limit	Value
Maximum character length of a span event name	128
Maximum number of span events per span	8
Maximum number of attributes per span event	8 ¹
Maximum character length for span event attribute keys	128
Maximum character length for span event attribute values	2,048
Maximum number of span links per span	128

¹ Resource, scope and span attributes do not count against this limit.

Span Links

Limit	Value
Maximum number of attributes per span link	8 ¹
Maximum character length for span link attribute keys	128
Maximum character length for span link attribute values	2,048

¹ Resource, scope and span attributes do not count against this limit.

Logging

Log Records and Log Events

Limit	Value
Maximum length of a log body	4 KB
Maximum number of attributes per log record	16 ¹
Maximum character length for log record attribute keys	128
Maximum character length for log record attribute values	2,048
Maximum past timestamp for a log record to be ingested	6 hours
Maximum future timestamp for a log record to be ingested	3 days

¹ Resource and scope attributes do not count against this limit.

Metrics

Limit	Value
Maximum character length of a metric name	128
Maximum character length of a metric description	512
Maximum character length of a metric unit	64
Maximum number of datapoints per metric	Unlimited
Maximum number of metadata entries per metric	8 ¹
Maximum character length for metadata keys	128
Maximum character length for metadata values	2,048

¹ Resource and scope attributes, and metrics metadata do not count against this limit.

Datapoints

Limit	Value
Maximum number of attributes per metric datapoint	16 ¹
Maximum character length for metric datapoint attribute keys	128
Maximum character length for metric datapoint attribute values	2,048
Maximum past timestamp for a metric datapoint to be ingested	6 hours
Maximum future timestamp for a metric datapoint to be ingested	3 days
Maximum count of exemplars	8
Maximum count of filtered attributes for an exemplar	8
Maximum character length for filtered attribute keys for an exemplar	128
Maximum character length for filtered attribute values for an exemplar	2,048
Maximum count of histogram buckets	32
Maximum count of quantiles for summaries	16