bvandeusenandClaude Opus 5.5
a805e1d539
#5764 "The agent reads a container's whole log backlog into memory, on its main loop, with no overall deadline". Docker03's 1.13.0 agent went silent for a day at 2.1 GB and 46 h of CPU, then ignored SIGTERM. - One shared reader, _docker_get: each answer has an overall deadline and a byte cap, not only a per-recv timeout. A trickling or endless body is cut off (15 s / 32 MiB for JSON, 5 s / 4 MiB for a log read). - Container logs: since the cursor but only the newest 2,000 lines, all within 10 s. A note says when older lines were skipped, and a container whose answer is too big skips ahead to now instead of re-reading its backlog every interval. - The agent reports its own RSS and CPU; Steward records agent_rss_bytes and agent_cpu_pct, so a runaway agent shows before it goes silent. Agent 1.15.0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
78 lines
3.4 KiB
Python
78 lines
3.4 KiB
Python
# plugins/host_agent/__init__.py
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from __future__ import annotations
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from quart import Quart
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_app: "Quart | None" = None
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def setup(app: "Quart") -> None:
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global _app
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_app = app
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# A host's CPU, memory and load per core learn their normal (#5742), each
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# with its floor from Settings → Thresholds. Parts don't: a host's CPU has
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# a normal, each of its cores doesn't. Disks stay on their fixed cutoffs:
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# a nearly full disk is a failure whatever its history (System 182).
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from steward.core.norms import floor_setting, learn_normal
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learn_normal("host_agent", "cpu_pct", floor_setting(app, "host_cpu_pct"), parts=False)
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learn_normal("host_agent", "mem_used_pct", floor_setting(app, "host_mem_pct"), parts=False)
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learn_normal("host_agent", "load_pct", floor_setting(app, "host_load_pct"), parts=False)
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# "Agent offline" speaks for everything the agent carries: while it is
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# firing, the host's other rules going silent isn't emailed (#5721).
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from steward.core.alerts import agent_fed, agent_heartbeat
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from steward.hosts.service import agent_stale_after_seconds
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agent_heartbeat("host_agent", "seconds_since_seen", lambda: agent_stale_after_seconds(app.config))
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agent_fed("host_agent", lambda resource: resource.split(":", 1)[0])
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# A reboot the agent announced is silence with a reason, for a while (#5756).
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from datetime import datetime, timezone
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from steward.core.alerts import agents_away
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from .downtime import hosts_away, restart_grace_seconds
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agents_away(lambda session: hosts_away(session, datetime.now(timezone.utc),
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restart_grace_seconds(app.config)))
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from steward.core.cleanup import prune_by_age
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from .models import HostDowntime
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prune_by_age(HostDowntime.started_at)
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def get_scheduled_tasks() -> list:
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from .scheduler import make_task
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return [make_task(_app)]
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def get_blueprint():
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from .routes import host_agent_bp
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return host_agent_bp
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def register_mcp_tools(register) -> None:
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from .mcp_tools import register_tools
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register_tools(register)
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async def mcp_overview(db) -> list[dict]:
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from .mcp_tools import mcp_overview as findings
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return await findings(db)
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def get_alert_metrics() -> dict[str, list[str]]:
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"""Host metrics ingest records for alert rules (resource = the host name;
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disk_used_pct per mount, resource "<host>:<mount>"). seconds_since_seen
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comes from the scheduler, not the agent: "agent offline" is > 180.
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clock_off_secs is how far the host's clock is from Steward's, either way
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(agent ≥ 1.12.0): "clock drifting" is > 30. load_pct is load_1m as a %
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of the host's cores. inodes_used_pct is per mount (agent ≥ 1.13.0), and
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disk_used_pct_worst is the fullest mount by space or inodes.
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mounts_stalled counts the mounts that didn't answer the agent in time
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(agent ≥ 1.14.0): "an NFS share stopped" is > 0. agent_rss_bytes and
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agent_cpu_pct are the agent's own memory and CPU (agent ≥ 1.15.0): a
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healthy agent sits in tens of MB and a few %."""
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return {"host_agent": [
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"cpu_pct", "mem_used_pct", "mem_available_bytes", "swap_used_bytes",
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"disk_used_pct_worst", "disk_used_pct", "inodes_used_pct", "load_1m", "load_5m", "load_15m",
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"load_pct",
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"uptime_secs", "seconds_since_seen", "clock_off_secs", "mounts_stalled",
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"agent_rss_bytes", "agent_cpu_pct",
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]}
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