diff --git a/core/healthcheck/counter_test.go b/core/healthcheck/counter_test.go
index 06f51d5..982bb96 100644
--- a/core/healthcheck/counter_test.go
+++ b/core/healthcheck/counter_test.go
@@ -13,6 +13,7 @@ type AtomicCounterTest struct {
 }
 
 func TestAtomicCounter(t *testing.T) {
+	t.Parallel()
 	suite.Run(t, new(AtomicCounterTest))
 }
 
diff --git a/core/healthcheck/iface.go b/core/healthcheck/iface.go
index 9c53ddf..d5cd195 100644
--- a/core/healthcheck/iface.go
+++ b/core/healthcheck/iface.go
@@ -21,8 +21,9 @@ type Storage interface {
 	Process(processor Processor)
 }
 
-// Counter will count successful and failed requests. Its contents can be used to judge if specific entity (e.g. Connection / Account)
-// is not working properly (invalid credentials, too many failed requests, etc) and take further action based on the result.
+// Counter will count successful and failed requests. Its contents can be used
+// to judge if specific entity (e.g. Connection / Account) is not working properly
+// (invalid credentials, too many failed requests, etc) and take further action based on the result.
 // Implementation should be goroutine-safe.
 type Counter interface {
 	// Name can be used as a more friendly identifier for the counter.
@@ -77,7 +78,8 @@ type NotifyMessageLocalizer interface {
 // It will send the notification to system admins.
 type NotifyFunc func(apiURL, apiKey, msg string) error
 
-// CounterConstructor is used to create counters. This way you can implement your own counter and still use default CounterStorage.
+// CounterConstructor is used to create counters.
+// This way you can implement your own counter and still use default CounterStorage.
 type CounterConstructor func(name string) Counter
 
 // ConnectionDataProvider should return the connection credentials and language by counter ID.
diff --git a/core/healthcheck/notifier_test.go b/core/healthcheck/notifier_test.go
index bb3aee1..8da1562 100644
--- a/core/healthcheck/notifier_test.go
+++ b/core/healthcheck/notifier_test.go
@@ -14,6 +14,7 @@ import (
 )
 
 func TestDefaultNotifyFunc(t *testing.T) {
+	t.Parallel()
 	apiURL := "https://test.retailcrm.pro"
 	apiKey := "key"
 	msg := "Notification"
@@ -37,6 +38,7 @@ func TestDefaultNotifyFunc(t *testing.T) {
 }
 
 func TestDefaultNotifyFunc_Error(t *testing.T) {
+	t.Parallel()
 	apiURL := "https://test.retailcrm.pro"
 	apiKey := "key"
 	msg := "Notification"
diff --git a/core/healthcheck/processor.go b/core/healthcheck/processor.go
index 4e213cc..fc11ccd 100644
--- a/core/healthcheck/processor.go
+++ b/core/healthcheck/processor.go
@@ -5,8 +5,8 @@ import (
 )
 
 const (
-	// DefaultMinRequests is a default minimal threshold of total requests. If Counter has less than this amount of requests
-	// total, it will be skipped because it can trigger false alerts otherwise.
+	// DefaultMinRequests is a default minimal threshold of total requests. If Counter has less than
+	// this amount of requests total, it will be skipped because it can trigger false alerts otherwise.
 	DefaultMinRequests = 10
 
 	// DefaultFailureThreshold is a default value of successful requests that should be passed in order to suppress any
@@ -26,7 +26,7 @@ type CounterProcessor struct {
 	Debug                  bool
 }
 
-func (c CounterProcessor) Process(id int, counter Counter) bool {
+func (c CounterProcessor) Process(id int, counter Counter) bool { // nolint:varnamelen
 	if counter.IsFailed() {
 		if counter.IsFailureProcessed() {
 			c.debugLog("skipping counter id=%d because its failure is already processed", id)
diff --git a/core/healthcheck/processor_test.go b/core/healthcheck/processor_test.go
index c6d30a9..9774310 100644
--- a/core/healthcheck/processor_test.go
+++ b/core/healthcheck/processor_test.go
@@ -19,6 +19,7 @@ type CounterProcessorTest struct {
 }
 
 func TestCounterProcessor(t *testing.T) {
+	t.Parallel()
 	suite.Run(t, new(CounterProcessorTest))
 }
 
@@ -349,10 +350,10 @@ func (cm *counterMock) FlushCounters() {
 }
 
 type notifierMock struct {
+	err     error
 	apiURL  string
 	apiKey  string
 	message string
-	err     error
 }
 
 func (n *notifierMock) Notify(apiURL, apiKey, msg string) error {