diff --git a/include/neuron/metrics.h b/include/neuron/metrics.h
index 12765c37..50e05664 100644
--- a/include/neuron/metrics.h
+++ b/include/neuron/metrics.h
@@ -41,16 +41,22 @@ typedef enum {
     NEU_METRIC_TYPE_GAUAGE,
     NEU_METRIC_TYPE_COUNTER_SET,
     NEU_METRIC_TYPE_ROLLING_COUNTER,
+
+    NEU_METRIC_TYPE_FLAG_NO_RESET = 0x80,
 } neu_metric_type_e;
 
+#define NEU_METRIC_TYPE_MASK 0x0F
+
 // node running state
 #define NEU_METRIC_RUNNING_STATE "running_state"
-#define NEU_METRIC_RUNNING_STATE_TYPE NEU_METRIC_TYPE_GAUAGE
+#define NEU_METRIC_RUNNING_STATE_TYPE \
+    (NEU_METRIC_TYPE_GAUAGE | NEU_METRIC_TYPE_FLAG_NO_RESET)
 #define NEU_METRIC_RUNNING_STATE_HELP "Node running state"
 
 // node link state
 #define NEU_METRIC_LINK_STATE "link_state"
-#define NEU_METRIC_LINK_STATE_TYPE NEU_METRIC_TYPE_GAUAGE
+#define NEU_METRIC_LINK_STATE_TYPE \
+    (NEU_METRIC_TYPE_GAUAGE | NEU_METRIC_TYPE_FLAG_NO_RESET)
 #define NEU_METRIC_LINK_STATE_HELP "Node link state"
 
 // last round trip time in millisends
@@ -86,13 +92,15 @@ typedef enum {
 // maintained by neuron core
 // number of tags in group
 #define NEU_METRIC_TAGS_TOTAL "tags_total"
-#define NEU_METRIC_TAGS_TOTAL_TYPE NEU_METRIC_TYPE_GAUAGE
+#define NEU_METRIC_TAGS_TOTAL_TYPE \
+    (NEU_METRIC_TYPE_GAUAGE | NEU_METRIC_TYPE_FLAG_NO_RESET)
 #define NEU_METRIC_TAGS_TOTAL_HELP "Total number of tags in the node"
 
 // maintained by neuron core
 // number of tags in group
 #define NEU_METRIC_GROUP_TAGS_TOTAL "group_tags_total"
-#define NEU_METRIC_GROUP_TAGS_TOTAL_TYPE NEU_METRIC_TYPE_GAUAGE
+#define NEU_METRIC_GROUP_TAGS_TOTAL_TYPE \
+    (NEU_METRIC_TYPE_GAUAGE | NEU_METRIC_TYPE_FLAG_NO_RESET)
 #define NEU_METRIC_GROUP_TAGS_TOTAL_HELP "Total number of tags in the group"
 
 // number of messages sent in last group timer
@@ -301,9 +309,24 @@ void neu_metrics_unregister_entry(const char *name);
 typedef void (*neu_metrics_cb_t)(const neu_metrics_t *metrics, void *data);
 void neu_metrics_visist(neu_metrics_cb_t cb, void *data);
 
+static inline bool neu_metric_type_is_counter(neu_metric_type_e type)
+{
+    return NEU_METRIC_TYPE_COUNTER == (type & NEU_METRIC_TYPE_MASK);
+}
+
+static inline bool neu_metric_type_is_rolling_counter(neu_metric_type_e type)
+{
+    return NEU_METRIC_TYPE_ROLLING_COUNTER == (type & NEU_METRIC_TYPE_MASK);
+}
+
+static inline bool neu_metric_type_no_reset(neu_metric_type_e type)
+{
+    return NEU_METRIC_TYPE_FLAG_NO_RESET & type;
+}
+
 static inline const char *neu_metric_type_str(neu_metric_type_e type)
 {
-    if (NEU_METRIC_TYPE_COUNTER == type) {
+    if (neu_metric_type_is_counter(type)) {
         return "counter";
     } else {
         return "gauge";
@@ -316,7 +339,7 @@ int neu_metric_entries_add(neu_metric_entry_t **entries, const char *name,
 
 static inline void neu_metric_entry_free(neu_metric_entry_t *entry)
 {
-    if (NEU_METRIC_TYPE_ROLLING_COUNTER == entry->type) {
+    if (neu_metric_type_is_rolling_counter(entry->type)) {
         neu_rolling_counter_free(entry->rcnt);
     }
     free(entry);
@@ -445,9 +468,9 @@ static inline int neu_node_metrics_update(neu_node_metrics_t *node_metrics,
         return -1;
     }
 
-    if (NEU_METRIC_TYPE_COUNTER == entry->type) {
+    if (neu_metric_type_is_counter(entry->type)) {
         entry->value += n;
-    } else if (NEU_METRIC_TYPE_ROLLING_COUNTER == entry->type) {
+    } else if (neu_metric_type_is_rolling_counter(entry->type)) {
         entry->value =
             neu_rolling_counter_inc(entry->rcnt, global_timestamp, n);
     } else {
@@ -465,9 +488,11 @@ static inline void neu_node_metrics_reset(neu_node_metrics_t *node_metrics)
     pthread_mutex_lock(&node_metrics->lock);
     HASH_LOOP(hh, node_metrics->entries, entry)
     {
-        entry->value = 0;
-        if (NEU_METRIC_TYPE_ROLLING_COUNTER == entry->type) {
-            neu_rolling_counter_reset(entry->rcnt);
+        if (!neu_metric_type_no_reset(entry->type)) {
+            entry->value = 0;
+            if (neu_metric_type_is_rolling_counter(entry->type)) {
+                neu_rolling_counter_reset(entry->rcnt);
+            }
         }
     }
 
@@ -476,9 +501,11 @@ static inline void neu_node_metrics_reset(neu_node_metrics_t *node_metrics)
     {
         HASH_LOOP(hh, g->entries, entry)
         {
-            entry->value = 0;
-            if (NEU_METRIC_TYPE_ROLLING_COUNTER == entry->type) {
-                neu_rolling_counter_reset(entry->rcnt);
+            if (!neu_metric_type_no_reset(entry->type)) {
+                entry->value = 0;
+                if (neu_metric_type_is_rolling_counter(entry->type)) {
+                    neu_rolling_counter_reset(entry->rcnt);
+                }
             }
         }
     }
diff --git a/plugins/restful/metric_handle.c b/plugins/restful/metric_handle.c
index d18884b0..daea80a9 100644
--- a/plugins/restful/metric_handle.c
+++ b/plugins/restful/metric_handle.c
@@ -181,7 +181,7 @@ static inline void gen_single_node_metrics(neu_node_metrics_t *node_metrics,
     pthread_mutex_lock(&node_metrics->lock);
     HASH_LOOP(hh, node_metrics->entries, e)
     {
-        if (NEU_METRIC_TYPE_ROLLING_COUNTER == e->type) {
+        if (neu_metric_type_is_rolling_counter(e->type)) {
             // force clean stale value
             e->value = neu_rolling_counter_inc(e->rcnt, global_timestamp, 0);
         }
@@ -196,7 +196,7 @@ static inline void gen_single_node_metrics(neu_node_metrics_t *node_metrics,
     {
         HASH_LOOP(hh, g->entries, e)
         {
-            if (NEU_METRIC_TYPE_ROLLING_COUNTER == e->type) {
+            if (neu_metric_type_is_rolling_counter(e->type)) {
                 // force clean stale value
                 e->value =
                     neu_rolling_counter_inc(e->rcnt, global_timestamp, 0);
@@ -278,7 +278,7 @@ static void gen_all_node_metrics(neu_metrics_t *metrics, int type_filter,
             pthread_mutex_lock(&n->lock);
             HASH_FIND_STR(n->entries, r->name, e);
             if (e) {
-                if (NEU_METRIC_TYPE_ROLLING_COUNTER == e->type) {
+                if (neu_metric_type_is_rolling_counter(e->type)) {
                     // force clean stale value
                     e->value =
                         neu_rolling_counter_inc(e->rcnt, global_timestamp, 0);
@@ -294,7 +294,7 @@ static void gen_all_node_metrics(neu_metrics_t *metrics, int type_filter,
             {
                 HASH_FIND_STR(g->entries, r->name, e);
                 if (e) {
-                    if (NEU_METRIC_TYPE_ROLLING_COUNTER == e->type) {
+                    if (neu_metric_type_is_rolling_counter(e->type)) {
                         // force clean stale value
                         e->value = neu_rolling_counter_inc(e->rcnt,
                                                            global_timestamp, 0);
diff --git a/src/adapter/adapter.c b/src/adapter/adapter.c
index f5531c69..df067bf3 100644
--- a/src/adapter/adapter.c
+++ b/src/adapter/adapter.c
@@ -426,13 +426,6 @@ static int adapter_update_metric(neu_adapter_t *adapter,
     return neu_node_metrics_update(adapter->metrics, group, metric_name, n);
 }
 
-static inline void adapter_reset_metrics(neu_adapter_t *adapter)
-{
-    if (NULL != adapter->metrics) {
-        neu_node_metrics_reset(adapter->metrics);
-    }
-}
-
 static int adapter_command(neu_adapter_t *adapter, neu_reqresp_head_t header,
                            void *data)
 {
@@ -1389,6 +1382,10 @@ int neu_adapter_start(neu_adapter_t *adapter)
     if (error == NEU_ERR_SUCCESS) {
         adapter->state = NEU_NODE_RUNNING_STATE_RUNNING;
         adapter_storage_state(adapter->name, adapter->state);
+        if (NEU_NA_TYPE_DRIVER == neu_adapter_get_type(adapter)) {
+            neu_adapter_driver_start_group_timer(
+                (neu_adapter_driver_t *) adapter);
+        }
     }
 
     return error;
@@ -1427,7 +1424,11 @@ int neu_adapter_stop(neu_adapter_t *adapter)
     if (error == NEU_ERR_SUCCESS) {
         adapter->state = NEU_NODE_RUNNING_STATE_STOPPED;
         adapter_storage_state(adapter->name, adapter->state);
-        adapter_reset_metrics(adapter);
+        if (NEU_NA_TYPE_DRIVER == neu_adapter_get_type(adapter)) {
+            neu_adapter_driver_stop_group_timer(
+                (neu_adapter_driver_t *) adapter);
+        }
+        neu_adapter_reset_metrics(adapter);
     }
 
     return error;
diff --git a/src/adapter/adapter_internal.h b/src/adapter/adapter_internal.h
index 156f4349..7afa19c8 100644
--- a/src/adapter/adapter_internal.h
+++ b/src/adapter/adapter_internal.h
@@ -96,6 +96,13 @@ int neu_adapter_set_setting(neu_adapter_t *adapter, const char *config);
 int neu_adapter_get_setting(neu_adapter_t *adapter, char **config);
 neu_node_state_t neu_adapter_get_state(neu_adapter_t *adapter);
 
+static inline void neu_adapter_reset_metrics(neu_adapter_t *adapter)
+{
+    if (NULL != adapter->metrics) {
+        neu_node_metrics_reset(adapter->metrics);
+    }
+}
+
 int  neu_adapter_register_group_metric(neu_adapter_t *adapter,
                                        const char *group_name, const char *name,
                                        const char *help, neu_metric_type_e type,
diff --git a/src/adapter/driver/driver.c b/src/adapter/driver/driver.c
index bd0adf4f..f294a9f3 100644
--- a/src/adapter/driver/driver.c
+++ b/src/adapter/driver/driver.c
@@ -102,8 +102,11 @@ static void update_with_meta(neu_adapter_t *adapter, const char *group,
                              const char *tag, neu_dvalue_t value,
                              neu_tag_meta_t *metas, int n_meta);
 static void write_response(neu_adapter_t *adapter, void *r, neu_error error);
-static group_t *find_group(neu_adapter_driver_t *driver, const char *name);
-static void     store_write_tag(group_t *group, to_be_write_tag_t *tag);
+static group_t *   find_group(neu_adapter_driver_t *driver, const char *name);
+static void        store_write_tag(group_t *group, to_be_write_tag_t *tag);
+static inline void start_group_timer(neu_adapter_driver_t *driver,
+                                     group_t *             grp);
+static inline void stop_group_timer(neu_adapter_driver_t *driver, group_t *grp);
 
 static void write_response(neu_adapter_t *adapter, void *r, neu_error error)
 {
@@ -324,9 +327,7 @@ int neu_adapter_driver_uninit(neu_adapter_driver_t *driver)
         HASH_DEL(driver->groups, el);
 
         neu_adapter_driver_try_del_tag(driver, neu_group_tag_size(el->group));
-        neu_adapter_del_timer((neu_adapter_t *) driver, el->report);
-        neu_event_del_timer(driver->driver_events, el->read);
-        neu_event_del_timer(driver->driver_events, el->write);
+        stop_group_timer(driver, el);
         if (el->grp.group_free != NULL) {
             el->grp.group_free(&el->grp);
         }
@@ -349,34 +350,67 @@ int neu_adapter_driver_uninit(neu_adapter_driver_t *driver)
     return 0;
 }
 
+static inline void start_group_timer(neu_adapter_driver_t *driver, group_t *grp)
+{
+    uint32_t interval = neu_group_get_interval(grp->group);
+
+    neu_event_timer_param_t param = {
+        .second      = interval / 1000,
+        .millisecond = interval % 1000,
+        .usr_data    = (void *) grp,
+        .type        = NEU_EVENT_TIMER_NOBLOCK,
+    };
+
+    param.type = driver->adapter.module->timer_type;
+    param.cb   = read_callback;
+    grp->read  = neu_event_add_timer(driver->driver_events, param);
+
+    struct timespec t1 = {
+        .tv_sec  = 0,
+        .tv_nsec = 1000 * 1000 * 20,
+    };
+    struct timespec t2 = { 0 };
+    nanosleep(&t1, &t2);
+
+    param.type  = NEU_EVENT_TIMER_NOBLOCK;
+    param.cb    = report_callback;
+    grp->report = neu_adapter_add_timer((neu_adapter_t *) driver, param);
+
+    param.second      = 0;
+    param.millisecond = 3;
+    param.cb          = write_callback;
+    grp->write        = neu_event_add_timer(driver->driver_events, param);
+}
+
 void neu_adapter_driver_start_group_timer(neu_adapter_driver_t *driver)
 {
     group_t *el = NULL, *tmp = NULL;
 
     HASH_ITER(hh, driver->groups, el, tmp)
     {
-        uint32_t                interval = neu_group_get_interval(el->group);
-        neu_event_timer_param_t param    = {
-            .second      = interval / 1000,
-            .millisecond = interval % 1000,
-            .usr_data    = el,
-            .type        = NEU_EVENT_TIMER_NOBLOCK,
-        };
+        start_group_timer(driver, el);
+        neu_adapter_update_group_metric(
+            &driver->adapter, neu_group_get_name(el->group),
+            NEU_METRIC_GROUP_TAGS_TOTAL, neu_group_tag_size(el->group));
+    }
 
-        param.type = driver->adapter.module->timer_type;
-        param.cb   = read_callback;
-        el->read   = neu_event_add_timer(driver->driver_events, param);
+    driver->adapter.cb_funs.update_metric(
+        &driver->adapter, NEU_METRIC_TAGS_TOTAL, driver->tag_cnt, NULL);
+}
 
-        struct timespec t1 = {
-            .tv_sec  = 0,
-            .tv_nsec = 1000 * 1000 * 20,
-        };
-        struct timespec t2 = { 0 };
-        nanosleep(&t1, &t2);
-
-        param.type = NEU_EVENT_TIMER_NOBLOCK;
-        param.cb   = report_callback;
-        el->report = neu_adapter_add_timer((neu_adapter_t *) driver, param);
+static inline void stop_group_timer(neu_adapter_driver_t *driver, group_t *grp)
+{
+    if (grp->report) {
+        neu_adapter_del_timer((neu_adapter_t *) driver, grp->report);
+        grp->report = NULL;
+    }
+    if (grp->read) {
+        neu_event_del_timer(driver->driver_events, grp->read);
+        grp->read = NULL;
+    }
+    if (grp->write) {
+        neu_event_del_timer(driver->driver_events, grp->write);
+        grp->write = NULL;
     }
 }
 
@@ -384,13 +418,7 @@ void neu_adapter_driver_stop_group_timer(neu_adapter_driver_t *driver)
 {
     group_t *el = NULL, *tmp = NULL;
 
-    HASH_ITER(hh, driver->groups, el, tmp)
-    {
-        neu_adapter_del_timer((neu_adapter_t *) driver, el->report);
-        el->report = NULL;
-        neu_event_del_timer(driver->driver_events, el->read);
-        el->read = NULL;
-    }
+    HASH_ITER(hh, driver->groups, el, tmp) { stop_group_timer(driver, el); }
 }
 
 void neu_adapter_driver_read_group(neu_adapter_driver_t *driver,
@@ -890,13 +918,6 @@ int neu_adapter_driver_add_group(neu_adapter_driver_t *driver, const char *name,
     if (find == NULL) {
         find = calloc(1, sizeof(group_t));
 
-        neu_event_timer_param_t param = {
-            .second      = interval / 1000,
-            .millisecond = interval % 1000,
-            .usr_data    = (void *) find,
-            .type        = NEU_EVENT_TIMER_NOBLOCK,
-        };
-
         pthread_mutex_init(&find->wt_mtx, NULL);
         pthread_mutex_init(&find->apps_mtx, NULL);
 
@@ -910,25 +931,9 @@ int neu_adapter_driver_add_group(neu_adapter_driver_t *driver, const char *name,
         neu_group_split_static_tags(find->group, &find->static_tags,
                                     &find->grp.tags);
 
-        param.type = driver->adapter.module->timer_type;
-        param.cb   = read_callback;
-        find->read = neu_event_add_timer(driver->driver_events, param);
-
-        struct timespec t1 = {
-            .tv_sec  = 0,
-            .tv_nsec = 1000 * 1000 * 20,
-        };
-        struct timespec t2 = { 0 };
-        nanosleep(&t1, &t2);
-
-        param.type   = NEU_EVENT_TIMER_NOBLOCK;
-        param.cb     = report_callback;
-        find->report = neu_adapter_add_timer((neu_adapter_t *) driver, param);
-
-        param.second      = 0;
-        param.millisecond = 3;
-        param.cb          = write_callback;
-        find->write       = neu_event_add_timer(driver->driver_events, param);
+        if (NEU_NODE_RUNNING_STATE_RUNNING == driver->adapter.state) {
+            start_group_timer(driver, find);
+        }
 
         REGISTER_GROUP_METRIC(&driver->adapter, find->name,
                               NEU_METRIC_GROUP_TAGS_TOTAL,
@@ -975,8 +980,9 @@ int neu_adapter_driver_update_group(neu_adapter_driver_t *driver,
     }
 
     // stop the timer first to avoid race condition
-    neu_adapter_del_timer((neu_adapter_t *) driver, find->report);
-    neu_event_del_timer(driver->driver_events, find->read);
+    if (NEU_NODE_RUNNING_STATE_RUNNING == driver->adapter.state) {
+        stop_group_timer(driver, find);
+    }
 
     // a diminutive value should keep the interval untouched
     if (interval < NEU_GROUP_INTERVAL_LIMIT) {
@@ -1005,31 +1011,12 @@ int neu_adapter_driver_update_group(neu_adapter_driver_t *driver,
         }
     }
 
-    neu_event_timer_param_t param = {
-        .second      = interval / 1000,
-        .millisecond = interval % 1000,
-        .usr_data    = (void *) find,
-        .type        = NEU_EVENT_TIMER_NOBLOCK,
-    };
-
     neu_group_set_interval(find->group, interval);
 
     // restore the timers
-
-    param.type = driver->adapter.module->timer_type;
-    param.cb   = read_callback;
-    find->read = neu_event_add_timer(driver->driver_events, param);
-
-    struct timespec t1 = {
-        .tv_sec  = 0,
-        .tv_nsec = 1000 * 1000 * 20,
-    };
-    struct timespec t2 = { 0 };
-    nanosleep(&t1, &t2);
-
-    param.type   = NEU_EVENT_TIMER_NOBLOCK;
-    param.cb     = report_callback;
-    find->report = neu_adapter_add_timer((neu_adapter_t *) driver, param);
+    if (NEU_NODE_RUNNING_STATE_RUNNING == driver->adapter.state) {
+        start_group_timer(driver, find);
+    }
 
     return ret;
 }
@@ -1045,9 +1032,10 @@ int neu_adapter_driver_del_group(neu_adapter_driver_t *driver, const char *name)
 
         neu_adapter_driver_try_del_tag(driver, neu_group_tag_size(find->group));
 
-        neu_adapter_del_timer((neu_adapter_t *) driver, find->report);
-        neu_event_del_timer(driver->driver_events, find->read);
-        neu_event_del_timer(driver->driver_events, find->write);
+        if (NEU_NODE_RUNNING_STATE_RUNNING == driver->adapter.state) {
+            stop_group_timer(driver, find);
+        }
+
         if (find->grp.group_free != NULL) {
             find->grp.group_free(&find->grp);
         }