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Grafana LokiOperationsStorageLog Entry Deletion

Log Entry Deletion

Log entry deletion is experimental. It is only supported for the BoltDB Shipper index store.

Grafana Loki supports the deletion of log entries from specified streams. Log entries that fall within a specified time window are those that will be deleted.

The Compactor component exposes REST endpoints that process delete requests. Hitting the endpoint specifies the streams and the time window. The deletion of the log entries takes place after a configurable cancellation time period expires.

Log entry deletion relies on configuration of the custom logs retention workflow as defined in Compactor. The Compactor looks at unprocessed requests which are past their cancellation period to decide whether a chunk is to be deleted or not.

Configuration

Enable log entry deletion by setting retention_enabled to true in the Compactor’s configuration. See the example in Retention Configuration.

A delete request may be canceled within a configurable cancellation period. Set the delete_request_cancel_period in the Compactor’s YAML configuration or on the command line when invoking Loki. Its default value is 24h.

Compactor endpoints

The Compactor exposes endpoints to allow for the deletion of log entries from specified streams.

Request log entry deletion

POST /loki/api/admin/delete
PUT /loki/api/admin/delete

Query parameters:

  • match[]=<series_selector>: Repeated label matcher argument that identifies the streams from which to delete. At least one match[] argument must be provided.
  • start=<rfc3339 | unix_timestamp>: A timestamp that identifies the start of the time window within which entries will be deleted. If not specified, defaults to 0, the Unix Epoch time.
  • end=<rfc3339 | unix_timestamp>: A timestamp that identifies the end of the time window within which entries will be deleted. If not specified, defaults to the current time.

A 204 response indicates success.

URL encode the match[] parameter. This sample form of a cURL command URL encodes match[]={foo="bar"}:

curl -g -X POST \ 
  'http://127.0.0.1:3100/loki/api/admin/delete?match[]={foo="bar"}&start=1591616227&end=1591619692' \ 
  -H 'x-scope-orgid: 1'

List delete requests

List the existing delete requests using the following API:

GET /loki/api/admin/delete

Sample form of a cURL command:

curl -X GET \
  <compactor_addr>/loki/api/admin/delete \
  -H 'x-scope-orgid: <orgid>'

This endpoint returns both processed and unprocessed requests. It does not list canceled requests, as those requests will have been removed from storage.

Request cancellation of a delete request

Loki allows cancellation of delete requests until the requests are picked up for processing. It is controlled by the delete_request_cancel_period YAML configuration or the equivalent command line option when invoking Loki.

Cancel a delete request using this Compactor endpoint:

POST /loki/api/admin/cancel_delete_request
PUT /loki/api/admin/cancel_delete_request

Query parameters:

  • request_id=<request_id>: Identifies the delete request to cancel; IDs are found using the delete endpoint.

A 204 response indicates success.

Sample form of a cURL command:

curl -X POST \
  '<compactor_addr>/loki/api/admin/cancel_delete_request?request_id=<request_id>' \
  -H 'x-scope-orgid: <tenant-id>'