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Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays1import assert from "node:assert/strict";
2import { test } from "node:test";
3
4import {
5 DEPLOY_GRACE_MS,
6 DEPLOY_MAX_MS,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders7 DETECT_BAD,
8 DETECT_WINDOW,
9 RECOVER_AFTER,
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays10 RECOVERED_FOR_MS,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders11 STALE_AFTER_MS,
12 STALE_EVERY_MS,
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays13 type DeployWindow,
14 type Streak,
15 autoDismissText,
16 deployChange,
17 deployQuiet,
18 detect,
19 detectedImpact,
20 draftTitle,
21 limitWords,
22 minutesWords,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders23 quietUntil,
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays24 recoverySentence,
25 settleDrafts,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders26 staleDrafts,
27 staleText,
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays28 troubleSentence,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders29 troubledNow,
30 upgradeStreak,
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays31} from "./detect.ts";
32
33const at = (minute: number) => new Date(Date.UTC(2026, 9, 5, 12, minute));
34
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders35type State = "up" | "degraded" | "down";
36
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays37/** Runs rounds of checks through detection, carrying the streaks along. */
38function run(
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders39 rounds: Record<string, State>[],
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays40 open: { id: string; components: string[] }[] = [],
41 maintenance = new Set<string>(),
42 quiet: (minute: number) => boolean = () => false,
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders43 start = new Map<string, Streak>(),
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays44) {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders45 let streaks = start;
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays46 const results = rounds.map((round, minute) => {
47 const found = detect(streaks, Object.entries(round).map(([component, state]) => ({ component, state })), open, maintenance, at(minute), { quiet: quiet(minute) });
48 streaks = new Map(found.streaks.map((s) => [s.component, s]));
49 return found;
50 });
51 return results;
52}
53
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders54/** One part's states as rounds: "x" down, "s" slow, "." up. */
55const rounds = (key: string, pattern: string): Record<string, State>[] =>
56 [...pattern].map((c) => ({ [key]: c === "x" ? "down" : c === "s" ? "degraded" : "up" }));
57
58test(`a draft at ${DETECT_BAD} bad of the last ${DETECT_WINDOW} checks, once`, () => {
59 assert.deepEqual([DETECT_BAD, DETECT_WINDOW, RECOVER_AFTER], [4, 5, 3]);
60 const found = run(rounds("api", "xxxxx"));
61 assert.deepEqual(found.map((r) => r.draft.length), [0, 0, 0, 1, 0]);
62 assert.deepEqual(found[3]!.draft[0], { key: "api", state: "down", since: at(0).toISOString(), checks: 4, of: 4 });
63});
64
65test("N of M: a good check between does not hide trouble that keeps coming", () => {
66 // Three in a row used to be the line, and one good check reset it: down, down, up, down, down was never drafted.
67 const found = run(rounds("api", "xx.xx"));
68 assert.deepEqual(found.map((r) => r.draft.length), [0, 0, 0, 0, 1]);
69 assert.deepEqual(found[4]!.draft[0], { key: "api", state: "down", since: at(0).toISOString(), checks: 4, of: 5 });
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays70});
71
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders72test("a blip is not an incident: three bad of five is under the line, and three good checks end the run", () => {
73 const flapping = run(rounds("api", "x.x.x.x"));
74 assert.ok(flapping.every((r) => r.draft.length === 0), "half the checks failing, alternately, is not four of five");
75 const blip = run(rounds("api", "xx...xx"));
76 assert.ok(blip.every((r) => r.draft.length === 0));
77 assert.equal(blip[4]!.streaks.length, 0, "three good checks in a row end the run");
78 assert.deepEqual(blip[6]!.streaks[0], { component: "api", state: "down", count: 2, checks: 2, recent: "xx", since: at(5).toISOString(), alerted: false });
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays79});
80
81test("slow then failing is one run, at its worst", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders82 const found = run(rounds("docs", "sxss"));
83 assert.deepEqual(found[3]!.draft, [{ key: "docs", state: "down", since: at(0).toISOString(), checks: 4, of: 4 }]);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays84});
85
86test("parts failing together share one draft", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders87 const found = run(Array.from({ length: 4 }, () => ({ api: "down" as const, git: "down" as const })));
88 assert.deepEqual(found[3]!.draft.map((d) => d.key), ["api", "git"]);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays89});
90
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders91test("with an incident already open on the part: a line on it, no draft; recovery is noted once the run ends", () => {
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays92 const open = [{ id: "inc1", components: ["api"] }];
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders93 const found = run(rounds("api", "xxxx..."), open);
94 assert.equal(found[3]!.draft.length, 0);
95 assert.deepEqual(found[3]!.failing, [{ incident: "inc1", key: "api", state: "down", since: at(0).toISOString(), checks: 4, of: 4 }]);
96 assert.deepEqual(found.map((r) => r.recovered.length), [0, 0, 0, 0, 0, 0, 1], "answering again is noted after three good checks, not the first");
97 assert.deepEqual(found[6]!.recovered, [{ incident: "inc1", key: "api", state: "down", since: at(0).toISOString(), checks: 4, of: 4 }]);
98 assert.equal(found[6]!.streaks.length, 0);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays99});
100
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders101test("a run that never crossed the line is not noted as a recovery", () => {
102 const found = run(rounds("api", "xx..."), [{ id: "inc1", components: ["api"] }]);
103 assert.ok(found.every((r) => r.recovered.length === 0));
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays104});
105
106test("parts under maintenance and unmonitored parts are left alone", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders107 const found = run(rounds("api", "xxxxx"), [], new Set(["api"]));
108 assert.ok(found.every((r) => r.draft.length === 0 && r.streaks.length === 0));
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays109 const none = detect(new Map(), [{ component: "sandboxes", state: "unmonitored" }], [], new Set(), at(0));
110 assert.equal(none.streaks.length, 0);
111});
112
113test("the draft says what failed", () => {
114 assert.equal(detectedImpact("down"), "major_outage");
115 assert.equal(detectedImpact("degraded"), "degraded");
116 assert.equal(draftTitle([{ name: "API", state: "down" }, { name: "Git", state: "down" }]), "Detected: API and Git not answering");
117 assert.equal(
118 draftTitle([{ name: "API", state: "down" }, { name: "Git", state: "down" }, { name: "MCP", state: "down" }, { name: "Docs", state: "degraded" }]),
119 "Detected: API, Git and MCP not answering; Docs slow",
120 );
121});
122
123test("a run that recovered is over: the next one starts fresh, with its own start", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders124 // 12:00 and 12:01 slow, then fine; slow again from 12:10.
125 const found = run(rounds("git", "ss........ssss"));
126 assert.equal(found[4]!.streaks.length, 0);
127 assert.equal(found[10]!.streaks[0]!.count, 1);
128 assert.equal(found[10]!.streaks[0]!.since, at(10).toISOString());
129 assert.equal(found[12]!.draft.length, 0, "three slow checks after a recovery are not four");
130 assert.deepEqual(found[13]!.draft, [{ key: "git", state: "degraded", since: at(10).toISOString(), checks: 4, of: 4 }]);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays131});
132
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders133test("a run slow for hours, raised long ago, still ends when the checks go healthy", () => {
134 // As kept before N of M: 300 slow checks in a row, raised.
135 const old = upgradeStreak({ component: "speed", state: "degraded", count: 300, since: at(0).toISOString(), alerted: true });
136 assert.deepEqual([old.checks, old.recent], [300, "sssss"]);
137 const open = [{ id: "d1", components: ["speed"] }];
138 const found = run(rounds("speed", "s.s...."), open, new Set(), () => false, new Map([["speed", old]]));
139 assert.ok(found.every((r) => r.draft.length === 0 && r.failing.length === 0), "already raised: nothing new");
140 assert.deepEqual(found.map((r) => r.recovered.length), [0, 0, 0, 0, 0, 1, 0]);
141 assert.deepEqual(found[5]!.recovered[0], { incident: "d1", key: "speed", state: "degraded", since: at(0).toISOString(), checks: 302, of: 303 });
142 assert.equal(found[5]!.streaks.length, 0);
143 // While the run lasts, only a bad latest check holds a draft up (settleDrafts).
144 assert.deepEqual(found.slice(0, 5).map((r) => r.streaks.filter(troubledNow).length), [1, 0, 1, 0, 0]);
145});
146
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays147test("during a deploy, trouble is counted but not drafted; it is drafted once it outlasts the window", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders148 // Quiet for minutes 0-4 (a deploy and its grace).
149 const quiet = (m: number) => m <= 4;
150 const blip = run(rounds("api", "xxxxx..."), [], new Set(), quiet);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays151 assert.ok(blip.every((r) => r.draft.length === 0), "a restart that recovers inside the window is never drafted");
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders152 assert.deepEqual(blip[3]!.held, ["api"]);
153 const lasting = run(rounds("api", "xxxxxx"), [], new Set(), quiet);
154 assert.deepEqual(lasting.map((r) => r.draft.length), [0, 0, 0, 0, 0, 1]);
155 assert.deepEqual(lasting[5]!.draft[0], { key: "api", state: "down", since: at(0).toISOString(), checks: 6, of: 6 }, "the draft keeps the run's true start");
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays156});
157
158test("during a deploy, an incident already open still hears about its parts", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders159 const found = run(rounds("api", "xxxx"), [{ id: "inc1", components: ["api"] }], new Set(), () => true);
160 assert.equal(found[3]!.failing.length, 1);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays161});
162
163test("the deploy window: running, finished plus grace, and a start that never finished", () => {
164 const t = (minute: number) => new Date(Date.UTC(2026, 9, 6, 7, minute));
165 assert.equal(deployQuiet(null, t(0)), false);
166 const running: DeployWindow = deployChange(null, "started", "abc", t(20));
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders167 assert.deepEqual(running, { id: "abc", started_at: t(20).toISOString(), finished_at: null, running: 1, last_started_at: t(20).toISOString() });
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays168 assert.equal(deployQuiet(running, t(25)), true);
169 assert.equal(deployQuiet(running, t(10)), false, "trouble before the deploy is not forgiven");
170 assert.equal(deployQuiet(running, new Date(t(20).getTime() + DEPLOY_MAX_MS)), false, "a deploy that never said it finished stops counting");
171 const finished = deployChange(running, "finished", null, t(26));
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders172 assert.deepEqual(finished, { id: "abc", started_at: t(20).toISOString(), finished_at: t(26).toISOString(), running: 0, last_started_at: t(20).toISOString() });
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays173 assert.equal(deployQuiet(finished, new Date(t(26).getTime() + DEPLOY_GRACE_MS - 1)), true);
174 assert.equal(deployQuiet(finished, new Date(t(26).getTime() + DEPLOY_GRACE_MS)), false);
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders175 assert.equal(quietUntil(finished), new Date(t(26).getTime() + DEPLOY_GRACE_MS).toISOString());
176 // A new start after the window closed begins a new window.
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays177 assert.equal(deployChange(finished, "started", "def", t(40)).started_at, t(40).toISOString());
178});
179
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders180test("deploys that overlap are one window, finished when the last one is", () => {
181 const t = (minute: number) => new Date(Date.UTC(2026, 9, 6, 7, minute));
182 // Two jobs of a stage start; the first finishes early.
183 let w = deployChange(null, "started", "abc", t(0));
184 w = deployChange(w, "started", "abc", t(1));
185 assert.equal(w.running, 2);
186 w = deployChange(w, "finished", "abc", t(4));
187 assert.deepEqual([w.finished_at, w.running], [null, 1], "one still running: not finished");
188 assert.equal(deployQuiet(w, t(12)), true, "the other job's restarts at 12 minutes are still forgiven");
189 w = deployChange(w, "finished", "abc", t(14));
190 assert.deepEqual([w.started_at, w.finished_at, w.running], [t(0).toISOString(), t(14).toISOString(), 0]);
191 // The next stage starts inside the grace period: the same window, from its first start.
192 w = deployChange(w, "started", "abc", t(15));
193 assert.deepEqual([w.started_at, w.finished_at, w.running], [t(0).toISOString(), null, 1]);
194 // The 30-minute cap counts from the latest start, not the first.
195 assert.equal(deployQuiet(w, t(40)), true);
196 assert.equal(deployQuiet(w, new Date(t(15).getTime() + DEPLOY_MAX_MS)), false);
197});
198
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays199test("a detected draft that recovers and stays healthy is dismissed; trouble in between starts the wait again", () => {
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders200 const draft = {
201 id: "d1",
202 title: "Detected: Git slow",
203 components: ["git"],
204 started_at: at(0).toISOString(),
205 declared_at: at(3).toISOString(),
206 healthy_since: null as string | null,
207 reminded_at: null,
208 };
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays209 const minute = 60_000;
210 // Still slow: not healthy.
211 assert.deepEqual(settleDrafts([draft], new Set(["git"]), at(3)), { healthy: [{ id: "d1", since: null }], dismiss: [] });
212 // Healthy from 12:04.
213 const first = settleDrafts([draft], new Set(), at(4));
214 assert.deepEqual(first.healthy, [{ id: "d1", since: at(4).toISOString() }]);
215 const waiting = { ...draft, healthy_since: at(4).toISOString() };
216 assert.equal(settleDrafts([waiting], new Set(), new Date(at(4).getTime() + RECOVERED_FOR_MS - minute)).dismiss.length, 0);
217 // A slow check in between: the wait starts again.
218 assert.deepEqual(settleDrafts([waiting], new Set(["git"]), at(8)).healthy, [{ id: "d1", since: null }]);
219 // Healthy long enough: dismissed, resolved when it recovered, lasting 4 minutes.
220 const done = settleDrafts([waiting], new Set(), new Date(at(4).getTime() + RECOVERED_FOR_MS));
221 assert.deepEqual(done.dismiss, [{ id: "d1", title: "Detected: Git slow", recovered_at: at(4).toISOString(), lasted_ms: 4 * minute }]);
222 assert.equal(done.healthy.length, 0);
223 // Other parts in trouble do not hold it up.
224 assert.equal(settleDrafts([waiting], new Set(["api"]), new Date(at(4).getTime() + RECOVERED_FOR_MS)).dismiss.length, 1);
225});
226
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders227test("a draft nobody acknowledges is raised again after 45 minutes, once, then every 6 hours", () => {
228 assert.deepEqual([STALE_AFTER_MS, STALE_EVERY_MS], [45 * 60_000, 6 * 3_600_000]);
229 const made = at(0);
230 const later = (ms: number) => new Date(made.getTime() + ms);
231 const draft = { id: "d1", title: "Detected: Page speed slow", declared_at: made.toISOString(), reminded_at: null as string | null };
232 assert.deepEqual(staleDrafts([draft], later(STALE_AFTER_MS - 1)), []);
233 assert.deepEqual(staleDrafts([draft], later(STALE_AFTER_MS)), [{ id: "d1", title: draft.title, waiting_ms: STALE_AFTER_MS }]);
234 // Raised at 45 minutes: not again the minute after, nor at 90 minutes.
235 const reminded = { ...draft, reminded_at: later(STALE_AFTER_MS).toISOString() };
236 assert.deepEqual(staleDrafts([reminded], later(STALE_AFTER_MS + 60_000)), []);
237 assert.deepEqual(staleDrafts([reminded], later(2 * STALE_AFTER_MS)), []);
238 assert.deepEqual(staleDrafts([reminded], later(STALE_AFTER_MS + STALE_EVERY_MS - 1)), []);
239 assert.equal(staleDrafts([reminded], later(STALE_AFTER_MS + STALE_EVERY_MS)).length, 1);
240 assert.equal(staleText(STALE_AFTER_MS, true), "Unacknowledged for 45 minutes. The alert address was emailed again.");
241 assert.equal(staleText(STALE_AFTER_MS + STALE_EVERY_MS, false), "Unacknowledged for 6h 45m.");
242});
243
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays244test("slow and down are said apart, with the run's own start", () => {
245 assert.equal(limitWords(1500), "1.5 s");
246 assert.equal(limitWords(800), "800 ms");
247 assert.equal(
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders248 troubleSentence("Git and repositories", { state: "degraded", checks: 4, of: 4 }, "6 Oct 07:25 UTC", 1500),
249 "Git and repositories has been slow — over 1.5 s — on 4 checks in a row since 6 Oct 07:25 UTC.",
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays250 );
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders251 assert.equal(troubleSentence("API", { state: "down", checks: 4, of: 5 }, "6 Oct 07:25 UTC", 1500), "API has not answered on 4 of 5 checks since 6 Oct 07:25 UTC.");
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays252 assert.equal(troubleSentence("API", { state: "down", checks: 3 }, "6 Oct 07:25 UTC", 1500), "API has not answered on 3 checks in a row since 6 Oct 07:25 UTC.");
Merge status detection: first-byte speed probe, deploy windows, 4 of 5 with a re-check, check history, reminders253 assert.match(recoverySentence("Git", { state: "degraded", checks: 4, of: 4 }, "6 Oct 07:25 UTC"), /^Git is back to normal speed, after being slow on 4 checks in a row/);
254 assert.match(recoverySentence("API", { state: "down", checks: 40, of: 42 }, "6 Oct 07:25 UTC"), /^API is answering again, after not answering on 40 of 42 checks/);
Spend caps: a monthly budget for comped workspaces and a daily breaker on what g1t pays255 assert.equal(minutesWords(30_000), "1 minute");
256 assert.equal(minutesWords(4 * 60_000), "4 minutes");
257 assert.equal(minutesWords(125 * 60_000), "2h 05m");
258 assert.equal(
259 autoDismissText(4 * 60_000, "6 Oct 07:29 UTC"),
260 "Recovered after 4 minutes, at 6 Oct 07:29 UTC, and stayed healthy for 10 minutes; dismissed automatically. It never appeared on the status page.",
261 );
262});

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