bvandeusen
3a54d6d71d
plugin_metrics had only a PK on id, so every host-detail, full-metrics, and dashboard-widget load sequentially scanned the entire time-series table — which grows by (sources × resources × sample cadence), so the host views got slower over time (operator-reported "blocked/slow" loads). monitor_results was already indexed, so the uptime aggregation wasn't the bottleneck. Add two composite indexes matching the hot query shapes: - (source_module, resource_name, recorded_at) — history range scans, fleet/ widget queries, and the 'host:%' sub-resource prefix. - (source_module, resource_name, metric_name, recorded_at) — the latest-value- per-metric group-by/self-join. Model __table_args__ + core migration 0023. Integration lane validates the migration via `alembic upgrade head`. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016Jg27rgypiW2efULXJDtMC
40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
"""Index plugin_metrics for host/dashboard reads
|
|
|
|
plugin_metrics had only a PK on id, so every host-detail / full-metrics /
|
|
dashboard-widget query (all filter by source_module + resource_name over a
|
|
recorded_at range) sequentially scanned the whole time-series table — slower as
|
|
samples accumulate. Add the two composite indexes that match those query shapes.
|
|
|
|
The non-concurrent CREATE INDEX takes a brief exclusive lock; it runs once at
|
|
startup migration time, acceptable for this table.
|
|
|
|
Revision ID: 0023_plugin_metrics_indexes
|
|
Revises: 0022_unify_monitors
|
|
Create Date: 2026-06-20
|
|
"""
|
|
from typing import Sequence, Union
|
|
from alembic import op
|
|
|
|
revision: str = "0023_plugin_metrics_indexes"
|
|
down_revision: Union[str, None] = "0022_unify_monitors"
|
|
branch_labels: Union[str, Sequence[str], None] = None
|
|
depends_on: Union[str, Sequence[str], None] = None
|
|
|
|
|
|
def upgrade() -> None:
|
|
op.create_index(
|
|
"ix_plugin_metrics_module_resource_recorded",
|
|
"plugin_metrics",
|
|
["source_module", "resource_name", "recorded_at"],
|
|
)
|
|
op.create_index(
|
|
"ix_plugin_metrics_module_resource_metric_recorded",
|
|
"plugin_metrics",
|
|
["source_module", "resource_name", "metric_name", "recorded_at"],
|
|
)
|
|
|
|
|
|
def downgrade() -> None:
|
|
op.drop_index("ix_plugin_metrics_module_resource_metric_recorded", "plugin_metrics")
|
|
op.drop_index("ix_plugin_metrics_module_resource_recorded", "plugin_metrics")
|