fix: only remove container id network aliases (#1724)

pkg/container/client.go

@@ -230,9 +230,18 @@ func (client dockerClient) GetNetworkConfig(c t.Container) *network.NetworkingCo
 	}
 
 	for _, ep := range config.EndpointsConfig {
-		// This keeps accumulating across upgrades with no apparent added value
+		aliases := make([]string, 0, len(ep.Aliases))
-		// so throwing the information away to prevent overflows.
+		cidAlias := c.ID().ShortID()
-		ep.Aliases = nil
+
+		// Remove the old container ID alias from the network aliases, as it would accumulate across updates otherwise
+		for _, alias := range ep.Aliases {
+			if alias == cidAlias {
+				continue
+			}
+			aliases = append(aliases, alias)
+		}
+
+		ep.Aliases = aliases
 	}
 	return config
 }

pkg/container/client_test.go

@@ -317,19 +317,20 @@ var _ = Describe("the client", func() {
 	})
 	Describe(`GetNetworkConfig`, func() {
 		When(`providing a container with network aliases`, func() {
-			It(`should purge the aliases`, func() {
+			It(`should omit the container ID alias`, func() {
-				aliases := []string{"One", "Two"}
 				client := dockerClient{
 					api:           docker,
 					ClientOptions: ClientOptions{PullImages: false, IncludeRestarting: false},
 				}
 				container := MockContainer(WithImageName("docker.io/prefix/imagename:latest"))
+
+				aliases := []string{"One", "Two", container.ID().ShortID(), "Four"}
 				endpoints := map[string]*network.EndpointSettings{
 					`test`: {Aliases: aliases},
 				}
 				container.containerInfo.NetworkSettings = &types.NetworkSettings{Networks: endpoints}
 				Expect(container.ContainerInfo().NetworkSettings.Networks[`test`].Aliases).To(Equal(aliases))
-				Expect(client.GetNetworkConfig(container).EndpointsConfig[`test`].Aliases).To(BeEmpty())
+				Expect(client.GetNetworkConfig(container).EndpointsConfig[`test`].Aliases).To(Equal([]string{"One", "Two", "Four"}))
 			})
 		})
 	})