[BEAM-8792] Bring back the names of the runtime metrics to "runtime"

• Type: Sub-task
• Status: Resolved
• Priority: P2
• Resolution: Not A Problem
• Fix Version/s: Not applicable
• Component/s: testing
• Assignee: Unassigned
• Reporter: Kamil Wasilewski
• Created: 20/Nov/19 20:55
• Updated: 24/Jul/20 19:53
• Resolved: 02/Jun/20 08:24

Description

Since this PR (https://github.com/apache/beam/pull/8941), the names of the runtime metrics defined in Python load tests pipelines have changed to a combination of metrics namespace and "runtime". This made querying BigQuery table containing the results more difficult. The goal is to bring back the names of the metrics to "runtime" to stay concise with the previous records.