The playbook
301 Redirects: Metrics and Measurement
Measure 301 redirects by defining valid single-hop redirect mappings precisely enough that two people can reproduce the result from the same records. Keep the reporting unit, date basis, and scope visible. Without those definitions, a change in the report may reflect a changed calculation rather than a changed customer outcome.
Put the task in context
Map a removed service page to its closest relevant replacement when one exists. Avoid chains such as old page to intermediate page to final page. Check query handling, trailing-slash behavior, and the destination's actual content as well as the reported status.
Create a metric definition
| Definition field | What it must explain |
|---|---|
| Measure | valid single-hop redirect mappings |
| Unit | What one page or query record or completed outcome represents |
| Included records | The scope identified by old URL and new URL |
| Date basis | The event date or period used to include a record |
| Exclusions | Tests, duplicates, or other records outside the agreed definition |
| Source owner | analytics owner |
Separate delivery checks from outcome measures
A delivery check asks whether the team completed a specific task, such as map old URLs to closely relevant replacements. An outcome measure asks what happened for the user or business afterward. Keep both visible. Completing the task is useful evidence of execution, but it does not by itself prove that the broader outcome improved.
Worked arithmetic example
Suppose an illustrative review includes 80 eligible records, and 60 satisfy the explicitly defined completion condition. The completion share is 60 ÷ 80 × 100 = 75%. This is hypothetical arithmetic, not an industry benchmark or a predicted improvement. It describes only the population and condition you defined.
For 301 redirects, explain the condition before applying that calculation. If the question is whether the team can test response codes and destination content, a record counts only when the evidence demonstrates that condition. Do not replace missing outcomes with successful ones just to complete a report.
Compare like with like
Keep the scope, date basis, and exclusions consistent between observations. If new URL changes meaning between periods, note the change and rebuild a comparable view where possible. A rate can also move because the composition of the underlying group changed, even when individual performance did not.
Investigate an unexpected result
- Check whether the underlying old URL records are complete.
- Look for this known failure: redirecting every removed page to the homepage.
- Verify that the process still includes: implement direct redirects without unnecessary chains.
- Reconcile a sample with the original record before changing the operating plan.
Use the report to choose an action
If the evidence supports a correction, choose a relevant replacement or an appropriate missing-page response. Record when the change occurred and what should be checked next. Keep uncertainty visible when the sample is small or the observation period is incomplete. The purpose of measurement is a better decision about valid single-hop redirect mappings, not a favorable-looking number.
Keep page purpose visible throughout the work. A technically valid page can still fail to answer the reader’s question. Separate access and discovery problems from content problems so that the assigned action matches the cause.
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