bvandeusenandClaude Opus 5.5
31e93e96cf
#5355 "Traefik page doesn't load": /plugins/traefik/rows took 12-28 s. It ran a query per router ever seen, and each raw row in the range was a heap fetch. traefik_004 rebuilds the router index to cover the charted columns and indexes scraped_at for the request chart; router_history reads the current routers' buckets in one query. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
35 lines
1.6 KiB
Python
35 lines
1.6 KiB
Python
"""Traefik reads answered from the index alone
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The rows page and the request chart read every raw row in the chosen range.
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With only (router_name, scraped_at) indexed, each of those rows was a heap
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fetch: a random disk read on a database whose indexes no longer fit in
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memory, which took the rows page to 12-28 s. Carrying the charted columns
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in the index makes these index-only scans; scraped_at gets an index of its
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own for the request chart, which filters on time across every router.
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Revision ID: traefik_004_covering_indexes
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Revises: traefik_003_access_log
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Create Date: 2026-10-08
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"""
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from typing import Sequence, Union
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from alembic import op
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revision: str = "traefik_004_covering_indexes"
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down_revision: Union[str, None] = "traefik_003_access_log"
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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op.drop_index("ix_traefik_metrics_router_scraped", "traefik_metrics")
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op.create_index("ix_traefik_metrics_router_scraped", "traefik_metrics", ["router_name", "scraped_at"],
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postgresql_include=["request_rate", "latency_p95_ms", "error_rate_5xx_pct"])
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op.create_index("ix_traefik_metrics_scraped", "traefik_metrics", ["scraped_at"],
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postgresql_include=["request_rate", "error_rate_5xx_pct"])
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def downgrade() -> None:
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op.drop_index("ix_traefik_metrics_scraped", "traefik_metrics")
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op.drop_index("ix_traefik_metrics_router_scraped", "traefik_metrics")
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op.create_index("ix_traefik_metrics_router_scraped", "traefik_metrics", ["router_name", "scraped_at"])
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