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FabledSteward/plugins/docker/__init__.py
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bvandeusenandClaude Opus 5.5 56063f27a4
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fix(docker): a container's memory is its processes' own; file cache shown on its page (#6030)
The agent sent Docker's working set (usage less inactive_file), which still
counts recently used file cache. A file-heavy container with no limit read
191 GB while its processes held 2.2 GB, and the host's own figure, which
already leaves cache out, disagreed with it.

Agent 1.23.0 sends mem_used_bytes / mem_used_pct (anon + shmem, so
Postgres's shared buffers count; v1: rss + shmem) and mem_cache_bytes
apart. The new names keep the two meanings apart in history and in learned
normals: docker_013 renames the columns, clears the old values and adds
mem_cache_bytes. The Docker page, swarm by-node sums, Busiest Containers,
container detail, normals and the MCP tools all read the new figure. File
cache is shown only on the container's page and in get_container.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-17 21:27:29 -04:00

99 lines
4.1 KiB
Python

# plugins/docker/__init__.py
from __future__ import annotations
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from quart import Quart
_app: "Quart | None" = None
def setup(app: "Quart") -> None:
global _app
_app = app
from .models import DockerContainer # noqa: F401 — register with Base
# Publish the per-host persist hook so the host agent can hand off the
# `docker` array from each sample without importing our models (opportunistic
# synergy — host_agent gates on has_capability and no-ops if we're disabled).
# required_role=viewer: this is a trusted server-side data-plane write driven
# by the authenticated agent ingest, not a user-facing privileged action.
from steward.core.capabilities import register_capability
from steward.models.users import UserRole
from .ingest import persist_host_docker
from .retention import prune_docker_logs, run_docker_retention
register_capability(
"docker.persist_host_samples", persist_host_docker,
label="Persist host Docker samples",
description="Store per-host container state + metrics pushed by the host agent.",
required_role=UserRole.viewer,
)
# Prune lifecycle events, driven by the core cleanup task without it
# importing our models. Same trusted server-side data-plane role as above.
# Container CPU and memory live in the one metric store and its retention.
register_capability(
"docker.run_retention", run_docker_retention,
label="Run Docker retention",
description="Prune Docker lifecycle events past their window.",
required_role=UserRole.viewer,
)
register_capability(
"docker.prune_logs", prune_docker_logs,
label="Prune Docker logs",
description="Keep each container's logs within the age window and byte cap.",
required_role=UserRole.viewer,
)
# Each container's CPU (100% is one core) and memory share learn their
# normal (#5742), each with its floor from Settings → Thresholds. Memory
# is its processes' own, file cache left out (#6030).
from steward.core.norms import floor_setting, learn_normal
learn_normal("docker", "cpu_pct", floor_setting(app, "container_cpu_pct"))
learn_normal("docker", "mem_used_pct", floor_setting(app, "container_mem_pct"))
# A host's agent carries its containers' figures: they go silent with it (#5721).
from steward.core.alerts import agent_fed
agent_fed("docker", lambda resource: resource.split("/", 1)[0])
def get_scheduled_tasks() -> list:
# Collection is now agent-driven (pushed to the host_agent ingest); the
# central socket scrape was removed. No periodic task to register.
return []
def get_blueprint():
from .routes import docker_bp
return docker_bp
def register_mcp_tools(register) -> None:
from .mcp_tools import register_tools
register_tools(register)
async def mcp_overview(db) -> list[dict]:
from .mcp_tools import mcp_overview as findings
return await findings(db)
async def mcp_events(db, host_id: str, host_name: str, since, until) -> list[dict]:
from .mcp_tools import mcp_events as events
return await events(db, host_id, host_name, since, until)
def get_nav() -> list[dict]:
# Surfaces in the sidebar's Infrastructure group (fleet-wide container view).
return [{"label": "Docker", "href": "/plugins/docker/"}]
def get_alert_metrics() -> dict[str, list[str]]:
"""What ingest.py records per container (resource "<host>/<container>"):
restart_count is cumulative (alert on crash-looping); is_healthy is 1.0 /
0.0 from the container's HEALTHCHECK, only for containers that define one.
Per host (resource "<host>"), what Docker keeps on its disk (#5304).
Swarm-wide (resource "swarm"), from any manager's report: services short
of their replicas, nodes down and managers unreachable, drained nodes
aside (#5788, swarm_health.py)."""
from .disk_view import DISK_METRICS
from .swarm_health import SWARM_METRICS
return {"docker": ["cpu_pct", "mem_used_pct", "restart_count", "is_healthy", *DISK_METRICS, *SWARM_METRICS]}