You can easily get log lines from Stackdriver with the gcloud CLI. Tack on jq to count the lines for a quick way to get a sense of log volume.

In this example, we're counting lines ingested from a Kubernetes cluster, but you can query whatever types of lines you like, but watch out for the timestamp! If you have a large volume of logs, this operation could take a long time.

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1gcloud logging read 'resource.type=container AND
2  resource.labels.cluster_name=my-cluster AND
3  resource.labels.namespace_id=default AND
4  logName=projects/my-project/logs/my-log-group AND
5  textPayload:"your operation failed" AND
6  timestamp>="2020-07-01T00:00:00Z"' --format=json | jq '. | length'