do not stop health check before sending signal

Docker daemon always stops healthcheck before sending signal to a
container now. However, when we use "docker kill" to send signals
other than SIGTERM or SIGKILL to a container, such as SIGINT,
daemon still stops container health check though container process
handles the signal normally and continues to work.

Signed-off-by: Ruilin Li <liruilin4@huawei.com>
(cherry picked from commit da574f9343)
Signed-off-by: Dani Louca <dani.louca@docker.com>

daemon/kill.go

@@ -64,8 +64,6 @@ func (daemon *Daemon) killWithSignal(container *containerpkg.Container, sig int)
 	container.Lock()
 	defer container.Unlock()
 
-	daemon.stopHealthchecks(container)
-
 	if !container.Running {
 		return errNotRunning(container.ID)
 	}

integration-cli/docker_cli_health_test.go

@@ -165,3 +165,29 @@ ENTRYPOINT /bin/sh -c "sleep 600"`))
 	waitForHealthStatus(c, name, "starting", "healthy")
 
 }
+
+// GitHub #37263
+func (s *DockerSuite) TestHealthKillContainer(c *check.C) {
+	testRequires(c, DaemonIsLinux) // busybox doesn't work on Windows
+
+	imageName := "testhealth"
+	buildImageSuccessfully(c, imageName, build.WithDockerfile(`FROM busybox
+HEALTHCHECK --interval=1s --timeout=5s --retries=5 CMD /bin/sh -c "sleep 1"
+ENTRYPOINT /bin/sh -c "sleep 600"`))
+
+	name := "test_health_kill"
+	dockerCmd(c, "run", "-d", "--name", name, imageName)
+	defer func() {
+		dockerCmd(c, "rm", "-f", name)
+		dockerCmd(c, "rmi", imageName)
+	}()
+
+	// Start
+	dockerCmd(c, "start", name)
+	waitForHealthStatus(c, name, "starting", "healthy")
+
+	dockerCmd(c, "kill", "-s", "SIGINT", name)
+	out, _ := dockerCmd(c, "inspect", "--format={{.State.Health.Status}}", name)
+	c.Check(out, checker.Equals, "healthy\n")
+
+}