feat(preprod): Add Datadog metrics for snapshot upload and diff lifecycle#111024
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NicoHinderling merged 5 commits intomasterfrom Mar 19, 2026
Merged
feat(preprod): Add Datadog metrics for snapshot upload and diff lifecycle#111024NicoHinderling merged 5 commits intomasterfrom
NicoHinderling merged 5 commits intomasterfrom
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…ycle Instruments the snapshot upload endpoint and compare_snapshots task with distribution metrics to enable observability into upload patterns, image volumes, diff durations, and build quality signals on the Preprod Health dashboard. Co-Authored-By: Claude <noreply@anthropic.com>
diff_duration_s was measured from comparison.date_added, which is set on first attempt creation via get_or_create. On retries the same record is reused, so the metric would include idle time between attempts. Now measured from task_start_time captured at the top of the function. zero_changes was not accounting for renamed_pairs, causing rename-only diffs to incorrectly increment the zero_changes counter. Co-Authored-By: Claude <noreply@anthropic.com>
The PreprodArtifact count query for bundles_per_commit sat unguarded in the critical path before downstream task dispatch. A DB timeout or error would prevent create_preprod_snapshot_status_check_task from ever being dispatched, orphaning the artifact. Wrap in try/except so a metrics failure cannot block the upload completion flow. Co-Authored-By: Claude <noreply@anthropic.com>
When all eligible image pairs error (e.g., objectstore outage, oversized images), changed_count stays 0 and added/removed/renamed are empty, causing zero_changes to fire incorrectly. Add error_count check so the metric only increments when the diff genuinely found no differences. Co-Authored-By: Claude <noreply@anthropic.com>
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| v["image_file_name"] for v in images.values() if v.get("image_file_name") | ||
| ) | ||
| duplicate_count = sum(c - 1 for c in file_name_counts.values() if c > 1) | ||
| metrics.distribution( |
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How often would we actually get duplicate images? This seems like a strange thing to record metrics on
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I think max added that in my requests doc
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i'll add a comment as a reminder to consider removing this
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actually im just going to kill this for now
rbro112
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Adds
metrics.distributionandmetrics.incrinstrumentation to the snapshot upload endpoint andcompare_snapshotstask so the Preprod Health dashboard can track snapshot usage and build quality signals.Metrics added
On upload (
ProjectPreprodSnapshotEndpoint.post):preprod.snapshots.upload.image_count— number of images per upload, taggedhas_vcsto distinguish CI builds from standalone uploadspreprod.snapshots.upload.duplicate_image_file_names— count ofimage_file_namecollisions within a single manifest (proxy for same screen uploaded under multiple hashes)preprod.snapshots.upload.bundles_per_commit— how many snapshot bundles have been uploaded for the same commit (only emitted whenhas_vcs=True)On diff completion (
compare_snapshotstask):preprod.snapshots.diff.duration_s— time from comparison record creation to diff task completionpreprod.snapshots.e2e_duration_s— time from artifact upload to diff completion, mirrors the existingpreprod.size_analysis.results_e2epatternpreprod.snapshots.image.avg_size_bytes— average byte size of images actually fetched for pixel diff (excludes added/removed)preprod.snapshots.diff.zero_changes— incremented when a diff completes with no changed, added, or removed imagesAll metrics use
sample_rate=1.0. No Amplitude analytics events are included — this is Datadog/tracemetrics only, targeting the existing Preprod Health dashboard.