feat(notifications): notify when a container exits on its own

ArcBox.xcodeproj/project.pbxproj

@@ -35,6 +35,7 @@
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 		172FA4919687A4616E0BC135 /* DaemonLoadingView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2E8FB9C9E3349126EF773522 /* DaemonLoadingView.swift */; };
+		17908606AF5BAB2C1CF57AE0 /* ContainerCrashDigest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7374C3209C972DE43E00DB60 /* ContainerCrashDigest.swift */; };
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@@ -60,6 +61,7 @@
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 		351718A1033DD049AED78108 /* DaemonNotificationRulesTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 535894F6E4F12A71E906ED02 /* DaemonNotificationRulesTests.swift */; };
+		356E130785578DE1A09A7F56 /* ContainerCrashDigestTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D4CE179496F58DB669A5A929 /* ContainerCrashDigestTests.swift */; };
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@@ -76,6 +78,7 @@
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 		44974322E172A05817F3D858 /* KubernetesListViewControllerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = C83FBFE31C0C7B96918BFCC6 /* KubernetesListViewControllerTests.swift */; };
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+		45778022E8C486C6A3D5F374 /* ContainerNotificationRules.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0D14D8CCDFD8775C585050EE /* ContainerNotificationRules.swift */; };
 		45BD43408706D6F5044BDEB2 /* VolumeTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4CEDB1A7E6E5F0EEA2214D21 /* VolumeTypes.swift */; };
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 		46717964B62163546276C1D1 /* AboutView+Sections.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC98017408ED56AFF734125A /* AboutView+Sections.swift */; };
@@ -154,6 +157,7 @@
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 		8939A06F20FE4F92A72E3372 /* ImageTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1E17CF68FBBA9447E1B15371 /* ImageTypes.swift */; };
+		8AF453BEA1520C931470A491 /* ContainerNotificationRulesTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B0A17EA6466F0BD7B28FF7EE /* ContainerNotificationRulesTests.swift */; };
 		8BBBA54130403D89D35986F7 /* ImageLayerChainTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = C964312D5336EE55A8E4680B /* ImageLayerChainTests.swift */; };
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@@ -226,6 +230,7 @@
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+		C3EEEE180810C9D5C5A1CC39 /* ContainerCrashReporter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9773282E754B05EDF5527CAB /* ContainerCrashReporter.swift */; };
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@@ -320,6 +325,7 @@
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 		0CE7897EE0D976BB19ADC2C5 /* SandboxEmptyState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SandboxEmptyState.swift; sourceTree = "<group>"; };
+		0D14D8CCDFD8775C585050EE /* ContainerNotificationRules.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContainerNotificationRules.swift; sourceTree = "<group>"; };
 		0EDE93A683D2613C431BEBF2 /* DockerCLIResolver.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DockerCLIResolver.swift; sourceTree = "<group>"; };
 		0F065A1CBDA891A5647FE6F6 /* K8sWatchTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = K8sWatchTests.swift; sourceTree = "<group>"; };
 		0FA3C6B6F10198DFC435A33E /* NetworkDetailViewControllerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetworkDetailViewControllerTests.swift; sourceTree = "<group>"; };
@@ -420,6 +426,7 @@
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 		7058C8975F3F2684714E24E2 /* SleepWakeManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SleepWakeManager.swift; sourceTree = "<group>"; };
 		725E693E00BCEB4D0ADE7A25 /* FleetControlClient */ = {isa = PBXFileReference; lastKnownFileType = folder; name = FleetControlClient; path = Packages/FleetControlClient; sourceTree = SOURCE_ROOT; };
+		7374C3209C972DE43E00DB60 /* ContainerCrashDigest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContainerCrashDigest.swift; sourceTree = "<group>"; };
 		738233A82C7BAA825F73EE2F /* GuestExportFixture.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GuestExportFixture.swift; sourceTree = "<group>"; };
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@@ -466,6 +473,7 @@
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 		9750454C23940C3F74E7690E /* ResourceListRowView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ResourceListRowView.swift; sourceTree = "<group>"; };
+		9773282E754B05EDF5527CAB /* ContainerCrashReporter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContainerCrashReporter.swift; sourceTree = "<group>"; };
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 		98C5CFE4B4D21711F8580690 /* SandboxTerminalTab.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SandboxTerminalTab.swift; sourceTree = "<group>"; };
@@ -495,6 +503,7 @@
 		B050286A2450880AC2C95342 /* ActivityContainerTable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActivityContainerTable.swift; sourceTree = "<group>"; };
 		B0841C2969EC1A1BC07489C8 /* SandboxTerminalSession.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SandboxTerminalSession.swift; sourceTree = "<group>"; };
 		B084B3E5BD66E2DA018764E8 /* QuitWindowControllerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = QuitWindowControllerTests.swift; sourceTree = "<group>"; };
+		B0A17EA6466F0BD7B28FF7EE /* ContainerNotificationRulesTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContainerNotificationRulesTests.swift; sourceTree = "<group>"; };
 		B2387BC90EBBF4477B65367E /* RunnerJobsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RunnerJobsView.swift; sourceTree = "<group>"; };
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 		B38661BA5859384BCCE61B0C /* PodDetailView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PodDetailView.swift; sourceTree = "<group>"; };
@@ -535,6 +544,7 @@
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 		D0A680191505746F5F6F5A0B /* SandboxTemplateModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SandboxTemplateModelTests.swift; sourceTree = "<group>"; };
 		D12C2D038DE6CC49702F85F0 /* ContainersViewModel+Docker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ContainersViewModel+Docker.swift"; sourceTree = "<group>"; };
+		D4CE179496F58DB669A5A929 /* ContainerCrashDigestTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContainerCrashDigestTests.swift; sourceTree = "<group>"; };
 		D4ED3EC883A488801DE03195 /* NetworksViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetworksViewModel.swift; sourceTree = "<group>"; };
 		D6F75C788ADEDBC9B1F007E3 /* QuitWindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = QuitWindowController.swift; sourceTree = "<group>"; };
 		DAE5A29026FA64A7C0A47122 /* SettingsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsView.swift; sourceTree = "<group>"; };
@@ -1210,6 +1220,9 @@
 			isa = PBXGroup;
 			children = (
 				98123C19CE4AB275C8D899E2 /* AppNotification.swift */,
+				7374C3209C972DE43E00DB60 /* ContainerCrashDigest.swift */,
+				9773282E754B05EDF5527CAB /* ContainerCrashReporter.swift */,
+				0D14D8CCDFD8775C585050EE /* ContainerNotificationRules.swift */,
 				FEA9D33B25DF9BB204D4B637 /* DaemonNotificationRules.swift */,
 				3D649CF8EC65915ED940D02A /* NotificationCoordinator.swift */,
 				665F6200AEC097082B2C43CA /* SandboxNotificationRules.swift */,
@@ -1252,6 +1265,8 @@
 				1DC5F65FECB2F80BA3AF1D84 /* ArcBoxClientErrorTests.swift */,
 				3750055AEC4C49576A78A909 /* ByteFormattingTests.swift */,
 				A10ED4BA65D6B9CC56B6B329 /* ChangelogParserTests.swift */,
+				D4CE179496F58DB669A5A929 /* ContainerCrashDigestTests.swift */,
+				B0A17EA6466F0BD7B28FF7EE /* ContainerNotificationRulesTests.swift */,
 				80010452354615CAC08FAF1D /* ContainersListViewControllerTests.swift */,
 				E610512C9106BB92A47DC044 /* ContainersViewModelTests.swift */,
 				DE7E377F9D8C89E24989DE3D /* ContentViewColumnLayoutTests.swift */,
@@ -1500,6 +1515,8 @@
 				50CCDEFCA186BCD1E99D291F /* ChangelogParser.swift in Sources */,
 				0A2CD753BB4FE0991213273A /* CommandEmptyStateView.swift in Sources */,
 				7DABE0FBDD17F88D47333964 /* CommandHint.swift in Sources */,
+				17908606AF5BAB2C1CF57AE0 /* ContainerCrashDigest.swift in Sources */,
+				C3EEEE180810C9D5C5A1CC39 /* ContainerCrashReporter.swift in Sources */,
 				7910184754585B4CF647FA92 /* ContainerDetailView.swift in Sources */,
 				967B79B7F3A20ACDDC610AD4 /* ContainerFilesTab.swift in Sources */,
 				766ECB0DA60ABA79FE21CE2C /* ContainerInfoTab.swift in Sources */,
@@ -1511,6 +1528,7 @@
 				012B6BCE79F6FAE406EE97A0 /* ContainerLogsTab+Views.swift in Sources */,
 				48014023336A8AD5D1B21A27 /* ContainerLogsTab.swift in Sources */,
 				8E9980682D9BB81A4CB35673 /* ContainerModel.swift in Sources */,
+				45778022E8C486C6A3D5F374 /* ContainerNotificationRules.swift in Sources */,
 				E9B0A374B532221710729A34 /* ContainerTerminalTab.swift in Sources */,
 				BF22080E6092E730A9DD1424 /* ContainerTypes.swift in Sources */,
 				FBE7E964F895EFE9C7818256 /* ContainerViewModel+Mapping.swift in Sources */,
@@ -1703,6 +1721,8 @@
 				AF8784321B0BF66F476749C5 /* BetterAuthClientTests.swift in Sources */,
 				70996419B03971A57B1DCF0F /* ByteFormattingTests.swift in Sources */,
 				31474CB365691C57A5568D14 /* ChangelogParserTests.swift in Sources */,
+				356E130785578DE1A09A7F56 /* ContainerCrashDigestTests.swift in Sources */,
+				8AF453BEA1520C931470A491 /* ContainerNotificationRulesTests.swift in Sources */,
 				DB19F0073D84ED7A7C937D49 /* ContainersListViewControllerTests.swift in Sources */,
 				4D2029E55A7979B8BD9EE89A /* ContainersViewModelTests.swift in Sources */,
 				A537498E1D8181BB0230E199 /* ContentViewColumnLayoutTests.swift in Sources */,

ArcBox/App/AppPreferences.swift

@@ -37,9 +37,15 @@ enum AppPreferences {
             "includeTimeMachine": false,
             "switchDockerContextAutomatically": true,
             "pauseContainersWhileSleeping": true,
-            AppNotification.Category.sandbox.preferenceKey: true,
-            AppNotification.Category.daemonHealth.preferenceKey: true,
         ])
+
+        // Delivery is gated by `bool(forKey:)`, which reads an unregistered key
+        // as false. Registering from `allCases` is what stops a new category
+        // from silently shipping switched off.
+        userDefaults.register(
+            defaults: Dictionary(
+                uniqueKeysWithValues: AppNotification.Category.allCases.map { ($0.preferenceKey, true) }
+            ))
     }
 
     static func hasCompletedOnboarding(in userDefaults: UserDefaults = .standard) -> Bool {

ArcBox/App/ApplicationCoordinator.swift

@@ -325,6 +325,9 @@ final class ApplicationCoordinator: NSObject {
         sandboxEventMonitor.onEvent = { [weak self] event in
             self?.notifications.handleSandboxEvent(event)
         }
+        eventMonitor.onEvent = { [weak self] event in
+            self?.notifications.handleDockerEvent(event)
+        }
         notifications.start()
     }
 
@@ -530,6 +533,7 @@ final class ApplicationCoordinator: NSObject {
             sandboxEventMonitor.stop()
             machineEventMonitor.stop()
             sleepWakeManager.stop()
+            notifications.runtimeStopped()
             updateDockerContext(useArcBox: false)
         }
     }

ArcBox/Services/DockerEventMonitor.swift

@@ -21,6 +21,11 @@ extension Notification.Name {
 @Observable
 final class DockerEventMonitor {
 
+    /// Called for every event as it arrives, before whitelisting and debounce.
+    /// The posted notifications carry no payload, so consumers that need the
+    /// event itself — notifications — take it from here.
+    @ObservationIgnored var onEvent: ((DockerClient.DockerEvent) -> Void)?
+
     // MARK: Action Whitelists
 
     private static let containerActions: Set<String> = [
@@ -107,6 +112,11 @@ final class DockerEventMonitor {
 
     /// Visible to tests via @testable import.
     func handleEvent(_ event: DockerClient.DockerEvent) {
+        // Every event, before the whitelist below: that filter exists to
+        // decide which list to refresh, and notification rules need actions
+        // it has no reason to carry.
+        onEvent?(event)
+
         switch event.type {
         case "container":
             guard Self.containerActions.contains(event.action) else { return }

ArcBox/Services/Notifications/AppNotification.swift

@@ -22,13 +22,15 @@ struct AppNotification: Equatable {
 extension AppNotification {
     enum Category: String, CaseIterable {
         case sandbox
+        case container
         case daemonHealth
 
         /// Preference gating delivery. Registered in `AppPreferences`, so an
         /// unset key reads as enabled rather than as `false`.
         var preferenceKey: String {
             switch self {
             case .sandbox: "notifySandboxResults"
+            case .container: "notifyContainerCrashes"
             case .daemonHealth: "notifyDaemonProblems"
             }
         }

ArcBox/Services/Notifications/ContainerCrashDigest.swift

@@ -0,0 +1,41 @@
+import Foundation
+
+/// Renders a batch of container deaths as one notification.
+enum ContainerCrashDigest {
+    /// Names listed in full before the body switches to a count.
+    private static let namesShown = 3
+
+    /// One rolling identifier: the latest digest is the current state of
+    /// things, and should replace whatever it superseded.
+    private static let identifier = "container.crashes"
+
+    static func notification(for crashes: [ContainerCrash]) -> AppNotification? {
+        // A container that died several times inside one window is one story.
+        var seen = Set<String>()
+        let unique = crashes.filter { seen.insert($0.containerID).inserted }
+
+        guard let first = unique.first else { return nil }
+
+        if unique.count == 1 {
+            return AppNotification(
+                identifier: identifier,
+                title: "Container exited",
+                body: "\(first.name) exited with code \(first.exitCode).",
+                destination: .section(.containers, id: first.containerID),
+                category: .container
+            )
+        }
+
+        let shown = unique.prefix(namesShown)
+        let names = shown.map(\.name).joined(separator: ", ")
+        let remainder = unique.count - shown.count
+        return AppNotification(
+            identifier: identifier,
+            title: "\(unique.count) containers exited",
+            body: remainder > 0 ? "\(names) and \(remainder) more." : "\(names).",
+            // No single container to select, so this lands on the list.
+            destination: .section(.containers, id: nil),
+            category: .container
+        )
+    }
+}