bvandeusenandClaude Opus 5.5
5dd9956f35
VDNT-Util01's / ran out of inodes (956 free of 60.8M) with 274G of space
left; every file create failed and Steward's page read healthy at 66%.
- Agent 1.13.0 reports each mount's inodes (statvfs; a filesystem reporting
none, like btrfs, is left without).
- Ingest records inodes_used_pct per mount, and disk_used_pct_worst is the
fullest mount by space or inodes, so existing disk-full rules and the
overview see it.
- The host's health strip, the Hosts widget and the host glance grade / by
whichever is fuller and name inodes when they are ("Disk / 66% · inodes
100%", "Inodes on / ... past its critical threshold").
Hosts pick up the inode figures once their agent is updated to 1.13.0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
301 lines
14 KiB
Python
301 lines
14 KiB
Python
"""get_overview: what is wrong right now, ranked, across everything Steward watches."""
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from __future__ import annotations
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import logging
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from datetime import timedelta
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from sqlalchemy import select
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from steward.alerts import service as alert_svc
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from steward.core import alerts
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from steward.core import anomalies as anom
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from steward.hosts import service as host_svc
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from steward.mcp._context import mcp_app
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from steward.models.ansible import AnsibleRun, AnsibleRunStatus
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from steward.models.hosts import Host
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from steward.models.monitors import Monitor
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from steward.models.users import UserRole
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from steward.monitors import service as monitor_svc
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from ._shape import age_s, db_session, iso, now_utc, rnd
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logger = logging.getLogger(__name__)
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FINDINGS_CAP = 50
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_SEVERITY = {"critical": 0, "warning": 1}
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def finding(severity: str, kind: str, subject: str, summary: str, *, since=None,
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ids: dict | None = None, next: str | None = None) -> dict:
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"""One overview finding. Plugins' `mcp_overview(db)` return a list of these."""
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return {
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"severity": severity, "kind": kind, "subject": subject, "summary": summary,
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"since": iso(since), "age_s": age_s(since), "ids": ids or {}, "next": next,
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}
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def rank(findings: list[dict]) -> list[dict]:
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"""Critical first; within a severity, the longest-standing first."""
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return sorted(findings, key=lambda f: (_SEVERITY.get(f.get("severity"), 2),
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-(f.get("age_s") or 0), f.get("subject", "")))
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def monitor_findings(monitors, states: dict, host_names: dict, now,
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tls: dict | None = None) -> list[dict]:
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"""Failing monitors, and HTTPS certificates inside the TLS window
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(`tls` is THRESHOLDS["tls_days"]: warn/crit days left)."""
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tls = tls or {"warn": 14, "crit": 3}
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out = []
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for m in monitors:
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if not m.enabled:
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continue
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st = states.get(m.id) or {}
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latest = st.get("latest")
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if latest is None:
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continue
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where = f" on {host_names[m.host_id]}" if m.host_id in host_names else ""
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ids = {"monitor_id": m.id, "host_id": m.host_id}
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if not latest.is_up:
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out.append(finding(
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"critical", "monitor_down", m.name,
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f"{m.type} check of {m.target}{where} is failing: {latest.error_msg or 'down'}",
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since=st.get("down_since") or latest.checked_at, ids=ids,
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next=f'get_monitor(monitor="{m.id}")'))
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elif latest.tls_expires_at is not None:
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days = (latest.tls_expires_at - now).total_seconds() / 86400.0
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if days <= tls["warn"]:
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out.append(finding(
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"critical" if days <= tls["crit"] else "warning", "tls_expiring", m.name,
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f"TLS certificate for {m.target} expires in {days:.1f} days",
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ids=ids, next=f'get_monitor(monitor="{m.id}")'))
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return out
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def fold_agent_silence(active, agent: dict) -> tuple[list, dict[str, list[str]], set[str]]:
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"""One silent agent is one finding (#5721). Returns (the active alerts left
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to list, {host: names of its rules silent with its agent}, the hosts
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whose "agent offline" alert is active and so speaks for the agent).
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A rule the agent feeds that has only gone quiet, on a host whose agent is
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stale, is folded under that host; one firing or pending stays listed,
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since what it measured before going quiet is news of its own."""
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offline = {name for name, a in agent.items() if a and not a.get("fresh")}
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kept, silent, speaking = [], {}, set()
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for state, rule in active:
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if alerts.is_heartbeat(rule):
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speaking.add(rule.resource_name)
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kept.append((state, rule))
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continue
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host = alerts.host_behind(rule)
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if host in offline and state.no_data_since is not None \
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and state.state.value not in ("firing", "pending", "acknowledged"):
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silent.setdefault(host, []).append(rule.name)
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continue
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kept.append((state, rule))
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return kept, silent, speaking
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def _also_silent(names: list[str] | None) -> str:
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return f"; also silent with it: {', '.join(sorted(names))}" if names else ""
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def alert_findings(active, silent: dict[str, list[str]] | None = None) -> list[dict]:
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out = []
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silent = silent or {}
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for state, rule in active:
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s = state.state.value
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if s == "firing":
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sev, what = "critical", "is firing"
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elif s == "pending":
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sev, what = "warning", "is pending (breaching, not yet for long enough to fire)"
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elif s == "acknowledged":
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sev, what = "warning", "is acknowledged but still breaching"
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else:
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s, sev, what = "no_data", "warning", "has stopped reporting"
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if state.no_data_since is not None and s != "no_data":
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what += f" and has stopped reporting (no data since {iso(state.no_data_since)})"
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if alerts.is_heartbeat(rule):
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what += _also_silent(silent.get(rule.resource_name))
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out.append(finding(
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sev, f"alert_{s}", rule.name,
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f"{rule.metric_name} {rule.operator.value} {rule.threshold:g} on "
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f"{rule.source_module}/{rule.resource_name} {what}",
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since=state.no_data_since if s == "no_data" else state.last_transition_at,
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ids={"rule_id": rule.id},
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next=f'get_alert_history(rule="{rule.id}")'))
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return out
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_AGENT_CHECKS = (("cpu_pct", "cpu", "CPU"), ("mem_used_pct", "mem", "memory"),
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("disk_used_pct_worst", "disk", "fullest disk (space or inodes)"))
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def agent_findings(hosts, agent: dict, thresholds: dict,
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silent: dict[str, list[str]] | None = None,
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speaking: set[str] | frozenset = frozenset()) -> list[dict]:
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"""Hosts past a CPU, memory or disk cutoff, and agents that stopped
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reporting. A stale agent whose "agent offline" alert is active (`speaking`)
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is that alert's finding, not a second one (#5721)."""
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out = []
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silent = silent or {}
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for h in hosts:
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a = agent.get(h.name)
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if not a:
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continue
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ids = {"host_id": h.id}
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if not a.get("fresh"):
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if h.name not in speaking:
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out.append(finding(
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"warning", "agent_stale", h.name,
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"host agent has stopped reporting; its metrics are out of date"
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+ _also_silent(silent.get(h.name)),
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since=a.get("last_at"), ids=ids, next=f'get_host(host="{h.id}")'))
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continue # stale values would only add noise
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# CPU and memory within the host's own normal for the hour aren't
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# findings (#5742); the fullest disk keeps its cutoff.
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normals = host_svc.host_normals(a.get("norms"), thresholds)
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for metric, kind, label in _AGENT_CHECKS:
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value = a.get(metric)
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th = thresholds.get(kind) or {}
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if value is None or th.get("warn") is None:
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continue
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if th.get("crit") is not None and value >= th["crit"]:
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sev = "critical"
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elif value >= th["warn"]:
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sev = "warning"
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else:
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continue
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if kind in normals and not anom.against(value, normals[kind][0], normals[kind][1], "%")[0]:
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continue
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out.append(finding(
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sev, f"host_{kind}_high", h.name,
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f"{label} at {rnd(value, 1)}% (warn {th['warn']}%, crit {th.get('crit')}%)",
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ids=ids, next=f'get_host_metrics(host="{h.id}", metric="{metric}")'))
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return out
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def run_findings(runs) -> list[dict]:
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out = []
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for r in runs:
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failures = ((r.results or {}).get("failures") or [])[:3]
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detail = f": {'; '.join(str(f)[:200] for f in failures)}" if failures else ""
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out.append(finding(
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"warning", f"ansible_run_{r.status.value}", r.playbook_path,
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f"Ansible run of {r.playbook_path} ({r.source_name}) {r.status.value}{detail}",
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since=r.finished_at or r.started_at, ids={"run_id": r.id}))
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return out
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def anomaly_findings(open_now) -> list[dict]:
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"""Metric anomalies going on now (#5740): a warning each."""
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from steward.core.formatting import metric_label, metric_value
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out = []
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for a in open_now:
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out.append(finding(
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"warning", "metric_anomaly", f"{a.resource_name} {metric_label(a.metric_name)}",
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f"Metric anomaly: {metric_label(a.metric_name)} on {a.resource_name} held "
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f"{metric_value(a.metric_name, a.peak_level)} where "
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f"{metric_value(a.metric_name, a.usual_hold)} is usual for that hour"
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+ (f" ({a.occurrences} times since {iso(a.started_at)})" if a.occurrences > 1 else ""),
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since=a.last_started_at, ids={"anomaly_id": a.id},
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next=f'list_anomalies(review="{a.review}")'))
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return out
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async def _plugin_findings(server) -> tuple[list[dict], list[str]]:
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found, unavailable = [], []
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for plugin, source in sorted((getattr(server, "overview_sources", None) or {}).items()):
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if not server.plugin_enabled(plugin):
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continue
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try:
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async with db_session() as db:
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found.extend(await source(db))
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except Exception:
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logger.exception("MCP overview source of plugin %r failed", plugin)
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unavailable.append(plugin)
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return found, unavailable
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async def get_overview() -> dict:
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"""What is wrong right now, across everything Steward watches. Start here.
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Returns `findings` ranked critical first, then longest-standing first:
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failing monitors (with the error and since when), firing, pending and
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still-breaching acknowledged alerts, TLS certificates near expiry, host
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agents that stopped reporting, hosts over their CPU, memory or disk
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limits (all cutoffs are set under Settings → Thresholds), Ansible runs that failed
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in the last 24h, metrics going on now well above what is normal for them
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at this hour (metric anomalies), and anything enabled plugins add
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(unhealthy containers, for one). Each finding carries the ids to follow
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and `next`, the call that shows its evidence.
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`counts` sizes the fleet; `counts.anomalies_to_review` is how many metric
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anomalies wait for someone to mark them normal or real (list_anomalies).
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`active_maintenance` names windows currently silencing alerts.
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`all_clear` is true when nothing is wrong.
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"""
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app = mcp_app()
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now = now_utc()
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async with db_session() as db:
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hosts = list((await db.execute(select(Host).order_by(Host.name))).scalars())
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host_names = {h.id: h.name for h in hosts}
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monitors = list((await db.execute(select(Monitor).order_by(Monitor.name))).scalars())
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states = await monitor_svc.monitor_states(db, [m for m in monitors if m.enabled])
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active = await alert_svc.active_alerts(db)
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agent = await host_svc.agent_overview_by_host(
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db, [h.name for h in hosts], host_svc.agent_stale_after_seconds(app.config))
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runs = list((await db.execute(
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select(AnsibleRun)
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.where(AnsibleRun.status.in_((AnsibleRunStatus.failed, AnsibleRunStatus.interrupted)),
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AnsibleRun.started_at >= now - timedelta(hours=24))
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.order_by(AnsibleRun.started_at.desc())
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.limit(20)
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)).scalars())
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windows = await alert_svc.list_maintenance_windows(db)
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open_anomalies = await anom.open_anomalies(db)
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to_review = await anom.to_review_count(db)
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thresholds = app.config.get("THRESHOLDS") or {}
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listed, silent, speaking = fold_agent_silence(active, agent)
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findings = (monitor_findings(monitors, states, host_names, now, thresholds.get("tls_days"))
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+ alert_findings(listed, silent)
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+ agent_findings(hosts, agent, thresholds, silent, speaking)
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+ run_findings(runs)
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+ anomaly_findings(open_anomalies))
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plugin_found, unavailable = await _plugin_findings(getattr(app, "mcp_server", None))
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findings = rank(findings + plugin_found)
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down = sum(1 for m in monitors if m.enabled and (st := states.get(m.id))
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and st["latest"] is not None and not st["latest"].is_up)
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out = {
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"generated_at": iso(now),
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"all_clear": not findings,
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"counts": {
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"hosts": len(hosts),
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"monitors": len(monitors),
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"monitors_down": down,
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"alerts_active": len(active),
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"critical": sum(1 for f in findings if f["severity"] == "critical"),
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"warning": sum(1 for f in findings if f["severity"] == "warning"),
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"anomalies_to_review": to_review,
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},
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"active_maintenance": [
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{"window_id": w.id, "name": w.name, "end_at": iso(w.end_at),
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"scope": {"source_module": w.scope_source, "resource": w.scope_resource}}
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for w in windows if w.start_at <= now <= w.end_at
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],
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"findings": findings[:FINDINGS_CAP],
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"truncated": len(findings) > FINDINGS_CAP,
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}
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if out["truncated"]:
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out["more"] = (f"{len(findings) - FINDINGS_CAP} lower-ranked findings left out; "
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"list_monitors(state=\"down\"), list_alerts and list_hosts show everything.")
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if unavailable:
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out["unavailable"] = [f"{p} plugin's findings could not be read (see Steward's log)"
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for p in unavailable]
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return out
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def register(register_tool) -> None:
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register_tool(get_overview, role=UserRole.viewer, read_only=True)
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