prep release: v1.48.1

[bnjjj]

Note

When approved, this PR will merge into the 1.48.1 branch which will — upon being approved itself — merge into main.

Things to review in this PR:

• Changelog correctness (There is a preview below, but it is not necessarily the most up to date. See the Files Changed for the true reality.)
• Version bumps
• That it targets the right release branch (1.48.1 in this case!).

---

🚀 Features

📃 Configuration

Rename the telemetry selector to get studio operation id (PR #5337)

We introduced a new trace_id selector format in 1.48.0 which has been misnamed because it's not a trace id but the Apollo Studio Operation ID. If you want to access to this selector, here is an example:

telemetry:
  instrumentation:
    spans:
      router:
        "studio.operation.id":
            studio_operation_id: true

By @bnjjj in #5337

[router-perf]

CI performance tests

• step - Basic stress test that steps up the number of users over time
• reload - Reload test over a long period of time at a constant rate of users
• step-with-prometheus - A copy of the step test with the Prometheus metrics exporter enabled
• events_without_dedup_callback - Stress test for events with a lot of users and deduplication DISABLED using callback mode
• events - Stress test for events with a lot of users and deduplication ENABLED
• events_without_dedup - Stress test for events with a lot of users and deduplication DISABLED
• events_big_cap_high_rate_callback - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity using callback mode
• xlarge-request - Stress test with 10 MB request payload
• const - Basic stress test that runs with a constant number of users
• events_big_cap_high_rate - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity
• step-jemalloc-tuning - Clone of the basic stress test for jemalloc tuning
• xxlarge-request - Stress test with 100 MB request payload
• demand-control-uninstrumented - A copy of the step test, but with demand control monitoring enabled
• no-graphos - Basic stress test, no GraphOS.
• events_callback - Stress test for events with a lot of users and deduplication ENABLED in callback mode
• large-request - Stress test with a 1 MB request payload
• demand-control-instrumented - A copy of the step test, but with demand control monitoring and metrics enabled

[garypen]

This is odd.

[bnjjj]

I think the main reason is because it has been added after the prep or after executing the xtask command for the previous release. @Geal might know

[abernix]

Yeah, this is understood BUT expected. It was previously odd. This just finally fixes it.

[garypen]

Suggested change

	We introduced a new `trace_id` selector format in `1.48.0` which has been misnamed because it's not a trace id but the Apollo Studio Operation ID. If you want to access to this selector, here is an example:
	We introduced a new `trace_id` selector format in `1.48.0` which was misnamed. It's not a trace id, it's the Apollo Studio Operation ID. We've fixed this naming problem in this release.
	If you want to access this selector, here is an example:

[abernix]

Suggested change

## 🚀 Features

[abernix]

I'm going to close this so we can bring in one more PR. I'll apply the suggested edits above to the base branch.