internal/agent/inventory/collector.go

@@ -62,7 +62,7 @@ type Collector struct {
 
 	mu     sync.Mutex
 	cache  map[string]buildEntry // by Compose project
-	warned map[string]bool       // projects whose check failure was logged
+	warned map[string]bool       // logged warnings: "<project>" (check failed) and "<project>/<service>" (service not in config)
 }
 
 // buildEntry is the cached outcome of a build check. It is valid as long as
@@ -313,15 +313,22 @@ func (c *Collector) builtServices(ctx context.Context, project string, l stackLa
 	built, err := c.check.BuiltServices(ctx, project, l.workingDir, l.configFiles, l.envFile)
 	c.cache[project] = buildEntry{key: key, built: built, err: err, at: c.now()}
 	if err == nil {
-		delete(c.warned, project)
+		// Forget the project's warnings so they are logged again if the
+		// problem returns. Project names cannot contain "/".
+		for k := range c.warned {
+			if k == project || strings.HasPrefix(k, project+"/") {
+				delete(c.warned, k)
+			}
+		}
 	} else {
 		c.warnOnceLocked(project, "compose_build_check_failed", "project", project, "error", err)
 	}
 	return built
 }
 
-// warnOnce logs msg the first time it is called for key (until the next
-// successful check of the project resets it).
+// warnOnce logs msg the first time it is called for key. key is a project
+// name (its build check failed) or "<project>/<service>" (the service is not
+// in the project's config); a successful check of the project forgets both.
 func (c *Collector) warnOnce(key, msg string, args ...any) {
 	c.mu.Lock()
 	defer c.mu.Unlock()

internal/agent/inventory/collector_test.go

@@ -309,3 +309,30 @@ func TestSnapshot_ServiceAbsentFromConfigFailsClosed(t *testing.T) {
 	}
 	assert.Equal(t, 1, strings.Count(logs.String(), "compose_service_not_in_config"), "logged once per project")
 }
+
+func TestSnapshot_MissingServiceIsLoggedAgainAfterItCameBack(t *testing.T) {
+	file := filepath.Join(t.TempDir(), "compose.yaml")
+	write := func(body string) {
+		require.NoError(t, os.WriteFile(file, []byte(body), 0o644))
+	}
+	write("v1")
+	check := &fakeBuildCheck{built: map[string]bool{"db": false}} // "web" missing
+	c, _ := buildCollector(t, check, file)
+	var logs bytes.Buffer
+	c.log = slog.New(slog.NewTextHandler(&logs, nil))
+	snap := func() {
+		_, err := c.Snapshot(context.Background())
+		require.NoError(t, err)
+	}
+
+	snap()
+	write("v2 changed")
+	check.built = map[string]bool{"db": false, "web": false} // back
+	snap()
+	assert.Empty(t, c.warned, "warnings are forgotten once the project checks out")
+	write("v3 changed again")
+	check.built = map[string]bool{"db": false} // missing again
+	snap()
+
+	assert.Equal(t, 2, strings.Count(logs.String(), "compose_service_not_in_config"))
+}