File size: 11,678 Bytes
44084af | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 | """E3 routing and inhibition tickets: H13 (a page catch-all to the SRE pager above every team subtree), H15
(a legacy `match:` with an alternation that is a literal string), H21 (the severity inhibition on
`equal: [namespace]`), H25 (a new service's rules shipped without `team`, so they land on the root receiver)."""
from __future__ import annotations
import copy
import random
from . import prose_am as prose
from .items import Item, wpolicy
from .model import World, route_for_team, rules_named
from .repo import team_route
def _fyi(am) -> dict:
return next(r for r in am["route"]["routes"] if r.get("receiver") == "slack-sre-fyi")
# ---------------------------------------------------------------------------- H13
class CatchAllFirst(Item):
code, kind, ticket_like = "H13", "route", True
def setup(self, w, rng):
self.p.update(quarter=rng.choice(["Q1", "Q2"]))
# only the catch-all moves: every team's subtree (own and shared) keeps its preservation cases at ticket
# and warning; pages are checked here, for every team, because the catch-all decides where they go
self.route_sev_touch = {"page"}
w.notes["pd_via"] = "sre"
return True
def break_(self, files, am, w):
f = _fyi(am)
f.clear()
f.update({"matchers": ['severity=~"page|critical"'], "receiver": "pagerduty-sre",
"_comment": [f"SRE covers every page while teams build their rotas ({self.p['quarter']})"]})
def spec(self, w, rng):
pos, neg = [], []
for t in list(w.teams) + list(w.shared_teams):
svc = next((s.name for s in w.services if s.team == t), f"{t}-svc")
for sev in ("page", "critical"):
lab = {"alertname": "SyntheticPage", "severity": sev, "team": t, "service": svc}
pos.append({"labels": lab, "expect": wpolicy(w, t, sev)})
neg.append({"labels": lab, "forbid": ["pagerduty-sre"]})
for sev, name in (("ticket", "SyntheticTicket"), ("warning", "SyntheticWarning")):
pos.append({"labels": {"alertname": name, "severity": sev, "team": t, "service": svc},
"expect": wpolicy(w, t, sev)})
return self.entry(route={"pos": pos, "neg": neg}), []
def variants(self, w):
def split(files, am):
routes = am["route"]["routes"]
i = routes.index(_fyi(am))
routes[i:i + 1] = [{"matchers": ['severity="page"'], "receiver": "slack-sre-fyi", "continue": True},
{"matchers": ['severity="critical"'], "receiver": "slack-sre-fyi", "continue": True}]
def cont(files, am):
self.break_(files, am, w)
next(r for r in am["route"]["routes"] if r.get("receiver") == "pagerduty-sre")["continue"] = True
def bottom(files, am):
self.break_(files, am, w)
routes = am["route"]["routes"]
r = next(x for x in routes if x.get("receiver") == "pagerduty-sre")
routes.remove(r)
routes.append(r)
return [("oracle", lambda f, a: None, "accept"), ("two_fyi_routes", split, "accept"),
("keep_sre_pager_with_continue", cont, 0.0), ("catchall_moved_to_bottom", bottom, 0.85),
("pristine", lambda f, a: self.break_(f, a, w), 0.0)]
def ticket(self, w, rng):
return prose.h13(self, w, rng)
# ---------------------------------------------------------------------------- H15
class MatchLiteral(Item):
code, kind, ticket_like = "H15", "route", True
def setup(self, w, rng):
t = w.notes.get("legacy_match_team")
if not t or t in w.notes.get("route_busy", set()) or t in (w.trigger.get("new"), w.trigger.get("old")):
return False
w.notes.setdefault("route_busy", set()).add(t)
self.p.update(team=t)
self.route_touch = {t}
w.notes.setdefault("pd_quiet", set()).update(s.name for s in w.services if s.team == t)
return True
def break_(self, files, am, w):
r = route_for_team(am, self.p["team"])
child = r["routes"][0]
child.pop("match_re", None)
child["match"] = {"severity": "page|critical"}
def spec(self, w, rng):
t = self.p["team"]
svc = next((s.name for s in w.services if s.team == t), f"{t}-svc")
pos = [{"labels": {"alertname": "Synthetic", "severity": sev, "team": t, "service": svc},
"expect": wpolicy(w, t, sev)} for sev in ("page", "critical", "ticket", "warning")]
neg = [{"labels": {"alertname": "Synthetic", "severity": "warning", "team": t, "service": svc},
"forbid": [f"pagerduty-{t}"]}]
return self.entry(route={"pos": pos, "neg": neg}), []
def variants(self, w):
def matchers(value):
def f(files, am):
child = route_for_team(am, self.p["team"])["routes"][0]
child.pop("match_re", None)
child.pop("match", None)
child["matchers"] = [value]
return f
return [("oracle", lambda f, a: None, "accept"), ("matchers_regex", matchers('severity=~"page|critical"'), "accept"),
("matchers_literal", matchers('severity="page|critical"'), 0.9),
("pristine", lambda f, a: self.break_(f, a, w), 0.9)]
def ticket(self, w, rng):
return prose.h15(self, w, rng)
# ---------------------------------------------------------------------------- H21
class SeverityInhibit(Item):
code, kind, ticket_like = "H21", "inhibit", True
def setup(self, w, rng):
crit = sorted({r["alert"] for f in w.files.values() if f.gen == 1 for g in f.groups for r in g["rules"]
if r.get("labels", {}).get("severity") == "critical"})
teamless = w.notes.get("teamless", set()) # H25's alerts carry no team: they never reach a team channel
by_svc = {s.name: [a for a in crit if a.startswith(s.camel) and a[len(s.camel):] in ("LatencyHigh", "DbConnectionsHigh")]
for s in w.services if s.name not in teamless}
both = [s for s, v in by_svc.items() if len(v) == 2]
if not both:
return False
s1 = rng.choice(both)
rest = [a for s, v in by_svc.items() if s != s1 for a in v]
if not rest:
return False
self.p.update(alerts=[by_svc[s1][0], rng.choice(rest), by_svc[s1][1]])
# `equal: [alertname, service]`: setting an alert's own service statically is in scope for this ticket
self.label_touch = {a: s.name for a in self.p["alerts"] for s in w.services if a.startswith(s.camel)
and a[len(s.camel):] in ("LatencyHigh", "DbConnectionsHigh")}
return True
@staticmethod
def _is(r):
return (r.get("source_matchers") == ['severity="critical"'] and r.get("target_matchers") == ['severity="warning"'])
def break_(self, files, am, w):
r = next(x for x in am["inhibit_rules"] if self._is(x))
r["equal"] = ["namespace"]
r["_comment"] = ["a critical anywhere in the namespace makes the warnings noise"]
def spec(self, w, rng):
ns = w.namespace
svc_of = {}
for s in w.services:
for a in self.p["alerts"]:
if a.startswith(s.camel):
svc_of[a] = s
a1, a2, other = self.p["alerts"]
s1, s2 = svc_of[a1], svc_of[a2]
def al(name, s, sev):
return {"alertname": name, "service": s.name, "severity": sev, "team": s.team, "namespace": ns}
cases = [{"source": al(a1, s1, "critical"), "target": al(a1, s1, "warning"), "expect": True},
{"source": al(a2, s2, "critical"), "target": al(a2, s2, "warning"), "expect": True},
{"source": al(a1, s1, "critical"), "target": al(a2, s2, "warning"), "expect": False},
{"source": al(a2, s2, "critical"), "target": al(a1, s1, "warning"), "expect": False}]
if other:
cases.append({"source": al(a1, s1, "critical"), "target": al(other, s1, "warning"), "expect": False})
return self.entry(inhibit={"cases": cases}), []
def variants(self, w):
def eq(v):
def f(files, am):
r = next(x for x in am["inhibit_rules"] if self._is(x))
r["equal"] = v
return f
return [("oracle", lambda f, a: None, "accept"), ("with_namespace_too", eq(["alertname", "service", "namespace"]), "accept"),
("equal_service_only", eq(["service"]), 0.9),
("removed", lambda f, a: a.update(inhibit_rules=[x for x in a["inhibit_rules"] if not self._is(x)]), 0.0),
("pristine", lambda f, a: self.break_(f, a, w), 0.0)]
def ticket(self, w, rng):
return prose.h21(self, w, rng)
# ---------------------------------------------------------------------------- H25
class MissingTeam(Item):
code, kind, ticket_like = "H25", "route", True
def setup(self, w, rng):
busy = w.notes.setdefault("busy", set())
cands = [s for s in w.services if s.kind == "api" and s.name not in busy
and s.team not in (w.trigger.get("new"), w.trigger.get("old"))]
if not cands:
return False
s = rng.choice(cands)
busy.add(s.name)
w.notes.setdefault("pd_quiet", set()).add(s.name)
w.notes.setdefault("teamless", set()).add(s.name)
self.p.update(svc=s.name, team=s.team)
names = sorted({r["alert"] for f in w.files.values() for g in f.groups for r in g["rules"]
if "alert" in r and f'service="{s.name}"' in r.get("expr", "") and r.get("labels", {}).get("team") == s.team})
self.p["alerts"] = names
self.touch = set(names)
self.names = set(names)
return bool(names)
def break_(self, files, am, w):
for n in self.p["alerts"]:
for _, _, r in rules_named(files, n):
r["labels"].pop("team", None)
def spec(self, w, rng):
t, s = self.p["team"], self.p["svc"]
chain = [{"alert": n, "service": s, "expect": {"page": wpolicy(w, t, "page"), "critical": wpolicy(w, t, "page"),
"ticket": wpolicy(w, t, "ticket"), "warning": wpolicy(w, t, "warning")}}
for n in self.p["alerts"]]
other = next(x.name for x in w.services if x.name != s)
neg = [{"labels": {"alertname": "SomethingDown", "severity": "page", "service": other}, "forbid": [f"pagerduty-{t}", "pagerduty-sre"]}]
return self.entry(route={"pos": [], "chain": chain, "neg": neg}), []
def variants(self, w):
t, s = self.p["team"], self.p["svc"]
def by_service(files, am):
self.break_(files, am, w)
r = copy.deepcopy(route_for_team(am, t))
r.pop("match", None)
r.pop("_comment", None)
r["matchers"] = [f'service="{s}"']
idx = next(i for i, x in enumerate(am["route"]["routes"]) if x.get("matchers") == [f'team="{t}"']
or (x.get("match") or {}).get("team") == t)
am["route"]["routes"].insert(idx, r)
def root_to_owner(files, am):
self.break_(files, am, w)
am["route"]["receiver"] = f"pagerduty-{t}"
return [("oracle", lambda f, a: None, "accept"), ("route_by_service", by_service, "accept"),
("root_pages_owner", root_to_owner, 0.5), ("pristine", lambda f, a: self.break_(f, a, w), 0.5)]
def ticket(self, w, rng):
return prose.h25(self, w, rng)
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