diff --git a/src/libs/zbxalerter/alert_manager.c b/src/libs/zbxalerter/alert_manager.c
index 88597d55d8d..facfb8cc96b 100644
--- a/src/libs/zbxalerter/alert_manager.c
+++ b/src/libs/zbxalerter/alert_manager.c
@@ -1116,10 +1116,18 @@ static int	mediatype_params_macro_resolv(zbx_macro_resolv_data_t *p, va_list arg
 	if (0 == p->indexed)
 	{
 		if (0 == strcmp(p->macro, MVAR_ALERT_SUBJECT))
+		{
 			*replace_to = zbx_strdup(*replace_to, subject);
+zabbix_log(LOG_LEVEL_DEBUG, "Andris1: %s(): replaced MVAR_ALERT_SUBJECT with:%s", __func__, *replace_to);
+		}
 		else if (0 == strcmp(p->macro, MVAR_ALERT_MESSAGE))
+		{
 			*replace_to = zbx_strdup(*replace_to, message);
+zabbix_log(LOG_LEVEL_DEBUG, "Andris2: %s(): replaced MVAR_ALERT_MESSAGE:%s", __func__, *replace_to);
+		}
 	}
+	else
+zabbix_log(LOG_LEVEL_DEBUG, "Andris3: %s(): replace nothing", __func__, *replace_to);
 
 	return SUCCEED;
 }
@@ -1156,6 +1164,7 @@ static char	*am_substitute_mediatype_params(const char *mediatype_params, const
 		zbx_json_free(&json);
 	}
 
+zabbix_log(LOG_LEVEL_DEBUG, "Andris4: %s(): returning alert_params:%s", __func__, alert_params);
 	return alert_params;
 }
 
@@ -1202,6 +1211,7 @@ static void	am_queue_watchdog_alerts(zbx_am_t *manager, const zbx_db_config_t *d
 
 		alert_params = am_substitute_mediatype_params(media->mediatype_params, alert_subject, alert_message);
 
+zabbix_log(LOG_LEVEL_DEBUG, "Andris5: %s(): callling am_create_alert() with alert_params:%s", __func__, alert_params);
 		alert = am_create_alert(0, media->mediatypeid, 0, 0, 0, media->sendto, alert_subject,
 				shared_str_new(alert_message), alert_params, mediatype->message_format, 0, 0, 0);
 
@@ -1385,6 +1395,7 @@ static void	am_sync_watchdog(zbx_am_t *manager, zbx_am_media_t **medias, int med
 		media->mediatype_type = medias[i]->mediatype_type;
 		ZBX_UPDATE_STR(media->mediatype_params, medias[i]->mediatype_params);
 
+zabbix_log(LOG_LEVEL_DEBUG, "Andris6: %s(): media->mediatype_params:%s", __func__, media->mediatype_params);
 		zbx_am_mediatype_t	*mediatype = am_get_mediatype(manager, media->mediatypeid);
 
 		if (SMTP_AUTHENTICATION_OAUTH == mediatype->smtp_authentication)
diff --git a/src/libs/zbxalerter/alert_syncer.c b/src/libs/zbxalerter/alert_syncer.c
index 8e694d33096..7004030d365 100644
--- a/src/libs/zbxalerter/alert_syncer.c
+++ b/src/libs/zbxalerter/alert_syncer.c
@@ -938,6 +938,7 @@ static void	get_mediatype_params(zbx_uint64_t mediatypeid, int mediatype_type, c
 	zbx_db_free_result(result);
 
 	*params = zbx_strdup(NULL, json.buffer);
+zabbix_log(LOG_LEVEL_DEBUG, "Andris7: %s(): *params:%s", __func__, *params);
 	zbx_json_free(&json);
 }
 
@@ -992,6 +993,7 @@ static void	am_db_update_watchdog(zbx_am_db_t *amdb, uint64_t alert_usrgrpid)
 
 		get_mediatype_params(media->mediatypeid, media->mediatype_type, &media->mediatype_params);
 
+zabbix_log(LOG_LEVEL_DEBUG, "Andris8: %s(): media->mediatype_params:%s", __func__, media->mediatype_params);
 		zbx_vector_am_media_ptr_append(&medias, media);
 		zbx_vector_uint64_append(&mediatypeids, media->mediatypeid);
 	}
diff --git a/src/libs/zbxalerter/alerter_protocol.c b/src/libs/zbxalerter/alerter_protocol.c
index 7b39482a626..ecd297d8320 100644
--- a/src/libs/zbxalerter/alerter_protocol.c
+++ b/src/libs/zbxalerter/alerter_protocol.c
@@ -663,6 +663,7 @@ zbx_uint32_t	zbx_alerter_serialize_medias(unsigned char **data, zbx_am_media_t *
 		ptr += zbx_serialize_str(ptr, media->sendto, sendto_len);
 		ptr += zbx_serialize_value(ptr, media->mediatype_type);
 		(void)zbx_serialize_str(ptr, media->mediatype_params, params_len);
+zabbix_log(LOG_LEVEL_DEBUG, "Andris9: %s(): media->mediatype_params:%s", __func__, media->mediatype_params);
 
 		data_offset += data_len;
 	}
@@ -695,6 +696,7 @@ void	zbx_alerter_deserialize_medias(const unsigned char *data, zbx_am_media_t **
 		data += zbx_deserialize_value(data, &media->mediatype_type);
 		data += zbx_deserialize_str(data, &media->mediatype_params, len);
 
+zabbix_log(LOG_LEVEL_DEBUG, "Andris10: %s(): media->mediatype_params:%s", __func__, media->mediatype_params);
 		(*medias)[i] = media;
 	}
 }