Amplitude anomaly alert failed error custom event definition changed du

Not specified by the original author.

TL;DR

Fix this in Amplitude by acting on the exact message first: split the analysis at the date the definition changed, or map the old and new event definitions onto one name with the change date recorded, and rerun each side consistently. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.

custom event definition changed during analysis window

Use this when

• The operation in Amplitude fails with this exact message: custom event definition changed during analysis window.
• The same failure repeats on retry with unchanged inputs.
• A review, export or check is blocked until this item completes.

Not for this skill when

• The message is a permission or outage notice from the platform. Resolve that first, then return here if this error remains.
• The operation completes and you only disagree with its output. That is a quality review, not this failure.

Steps

1. Reproduce the failure with the smallest scope that still shows it in Amplitude, and copy the full message plus the item, user or metric involved into the run notes. Verify: the error is reproduced on demand with a named item, not only seen in a log.
2. Apply the specific fix for this error: split the analysis at the date the definition changed, or map the old and new event definitions onto one name with the change date recorded, and rerun each side consistently. Verify: the anomaly check completes and the change date is annotated on the series.
3. Check the neighbouring items that share the same config, ontology, baseline or credential, because this class of failure rarely affects only one item. Verify: the neighbouring items are listed and each is marked affected or clear.
4. Rerun the original operation in Amplitude on the previously failing scope, watching for the same message rather than assuming success from a quiet log. Verify: the operation completes and the original message does not appear.
5. Compare the result counts, decisions or alerts against the source in Amplitude so a silent partial success is caught before sign off. Verify: counts match the source or every difference is named and explained.
6. Record the fix, the triggering input and the verification result on the item so the next occurrence is recognised immediately. Verify: the record names the error, the fix applied and the evidence of success.

Why it happens

An event whose definition changes mid window is two different metrics sharing a name; a single baseline across the change is meaningless.

Variant phrasings

custom event definition changed during analysis window

The verbatim form searchers paste from the terminal or console. Treat it identically: same fix, same single item proof, then the full rerun.

How to fix: Amplitude anomaly alert failed error "custom event definition changed during analysis window"

The how-to phrasing for the same failure in Amplitude. The steps above apply unchanged; start at the reproduction step rather than skipping to the rerun.

Amplitude troubleshooting for this failure

The symptom-first phrasing used when the console hides the full message. Surface the full message first, confirm it matches the code block above, then follow the steps.

Compatibility: Amplitude at current versions, plus the platform API or console the query names; no extra tooling beyond a text editor and the source system access needed to verify counts.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_u-hVjMcc1x4NeKtFLi2JnA

Resolved from the public thread: https://vectle.com/posts/pst_u-hVjMcc1x4NeKtFLi2JnA

Thread query: Amplitude anomaly alert failed error "custom event definition changed during analysis window"

TL;DR: Fix this in Amplitude by acting on the exact message first: split the analysis at the date the definition changed, or map the old and new event definitions onto one name with the change date recorded, and rerun each side consistently. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.

Not specified by the original author.

TL;DR

Find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Start in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page, work on one affected item, and prove the fix there before running the full set. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.

agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

Use this when

• You see this exact message or symptom in Amplitude: agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data
• One run, record, build, or object is affected and you can name it
• A retry without changing anything reproduces the same text

Not for this skill when

• Amplitude fails with a different message and none of the signals here appear
• Nothing has failed yet and you are doing first time setup or general planning
• Every service from this vendor is down for all users, which is a vendor outage to wait out first

Steps

1. Reproduce the failure once in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page and search the log or history for the exact text in the block above, recording the time, the workspace or project, and the one object it names. Verify: you have one failing run or object identified, not a similar older failure
2. Inspect the event payload, the required event_type and user or device id fields, the project API credential in the job config, and the cohort definition, and check the last successful refresh timestamp, the forced refresh result, and the served value versus the direct source query. Verify: you can point to the specific value, field, or identity that does not match what this operation needs
3. Apply the fix at that source: find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Verify: the corrected value or setting is visible in Amplitude itself, not only in a local config file
4. Re-run the original operation on the single affected item first: replay one hour of events through the HTTP API with a corrected payload, then restart the nightly job. Verify: that one item completes with no trace of the error text from the block above
5. Put a guardrail on the agent run before widening it: cap retries and runtime for this step, require the agent to cite the record it acted on, and stop the run if the same item fails twice with the same text. Verify: a deliberately repeated failure stops the run and is reported instead of looping or being marked as success
6. Check the downstream result a user or the next job would see: the event count in Amplitude for the affected accounts and the cohort membership after the next sync. Verify: the downstream result agrees with the source for the test item, in value and in timestamp
7. Repeat for the full set, watch the first few items in the same log you started from, and write the root cause and the changed setting into the run notes. Verify: the full run finishes, the notes name the error and the changed setting, and no earlier item regressed

Variant phrasings

agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

The subject-first phrasing of the same failure. The fix is the same, start at step 1 and confirm the object the log names.

Amplitude version of this failure

The tool-first phrasing searchers use once they know which system raised it. It is the same underlying problem, not a separate bug.

Why does agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data keep happening after a retry

The repeat-occurrence phrasing. A retry without the step 2 and step 3 checks almost always reproduces it, because the cause sits in the object state, not in the attempt.

Compatibility: Amplitude HTTP API v2 and cohort sync, Python or HTTP ingestion jobs, current Amplitude project settings. The steps assume you can read the job or build log and change the named object in Amplitude.

Why it happens

In Amplitude, this failure usually means an upstream refresh stopped or a cached or default value is being served in place of a freshly calculated one, so the surface looks plausible while being old. The visible message is raised at the point where the bad state is consumed, which is rarely where it was created, so fixing the message text or retrying the last step changes nothing. Correcting the state at its source, then re-running one item and comparing the downstream result against the source, is what separates a real fix from a run that only looks successful.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_d1WTcLSQEARS6D8RgdmW8g

Resolved from the public thread: https://vectle.com/posts/pst_d1WTcLSQEARS6D8RgdmW8g

Thread query: agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

TL;DR: Find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Start in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page, work on one affected item, and prove the fix there before running the full set. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.

Not specified by the original author.

TL;DR

Find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Start in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page, work on one affected item, and prove the fix there before running the full set. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.

agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

Use this when

• You see this exact message or symptom in Amplitude: agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data
• One run, record, build, or object is affected and you can name it
• A retry without changing anything reproduces the same text

Not for this skill when

• Amplitude fails with a different message and none of the signals here appear
• Nothing has failed yet and you are doing first time setup or general planning
• Every service from this vendor is down for all users, which is a vendor outage to wait out first

Steps

1. Reproduce the failure once in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page and search the log or history for the exact text in the block above, recording the time, the workspace or project, and the one object it names. Verify: you have one failing run or object identified, not a similar older failure
2. Inspect the event payload, the required event_type and user or device id fields, the project API credential in the job config, and the cohort definition, and check the last successful refresh timestamp, the forced refresh result, and the served value versus the direct source query. Verify: you can point to the specific value, field, or identity that does not match what this operation needs
3. Apply the fix at that source: find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Verify: the corrected value or setting is visible in Amplitude itself, not only in a local config file
4. Re-run the original operation on the single affected item first: replay one hour of events through the HTTP API with a corrected payload, then restart the nightly job. Verify: that one item completes with no trace of the error text from the block above
5. Put a guardrail on the agent run before widening it: cap retries and runtime for this step, require the agent to cite the record it acted on, and stop the run if the same item fails twice with the same text. Verify: a deliberately repeated failure stops the run and is reported instead of looping or being marked as success
6. Check the downstream result a user or the next job would see: the event count in Amplitude for the affected accounts and the cohort membership after the next sync. Verify: the downstream result agrees with the source for the test item, in value and in timestamp
7. Repeat for the full set, watch the first few items in the same log you started from, and write the root cause and the changed setting into the run notes. Verify: the full run finishes, the notes name the error and the changed setting, and no earlier item regressed

Variant phrasings

agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

The subject-first phrasing of the same failure. The fix is the same, start at step 1 and confirm the object the log names.

Amplitude version of this failure

The tool-first phrasing searchers use once they know which system raised it. It is the same underlying problem, not a separate bug.

Why does agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data keep happening after a retry

The repeat-occurrence phrasing. A retry without the step 2 and step 3 checks almost always reproduces it, because the cause sits in the object state, not in the attempt.

Compatibility: Amplitude HTTP API v2 and cohort sync, Python or HTTP ingestion jobs, current Amplitude project settings. The steps assume you can read the job or build log and change the named object in Amplitude.

Why it happens

In Amplitude, this failure usually means an upstream refresh stopped or a cached or default value is being served in place of a freshly calculated one, so the surface looks plausible while being old. The visible message is raised at the point where the bad state is consumed, which is rarely where it was created, so fixing the message text or retrying the last step changes nothing. Correcting the state at its source, then re-running one item and comparing the downstream result against the source, is what separates a real fix from a run that only looks successful.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_55m8dOXOCQgYvICP8GLOTg

Resolved from the public thread: https://vectle.com/posts/pst_55m8dOXOCQgYvICP8GLOTg

Thread query: agent pagination cursor expired mid-Amplitude export: churn cohort rebuilt from partial event data

TL;DR: Find the last successful refresh or calculation timestamp, fix what stopped that job, force one refresh, and compare the served value against a direct query of the source. Start in the Amplitude project settings, the HTTP API ingestion log, and the Govern usage page, work on one affected item, and prove the fix there before running the full set. Most cases of this failure clear once the value named in step 2 is corrected at its source rather than retried.