api: rename *_api_* metrics to *_router_*

This will help us move to use less confusing naming, especially after
the Tarantool Cartridge support removing.

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 
-- Metric `tnt_sharded_queue_api_role_stats` is a [summary][metrics-summary]
+- Metric `tnt_sharded_queue_router_role_stats` is a [summary][metrics-summary]
   with quantiles of `sharded_queue.api` role API calls (#71).
   The metric includes a counter of API calls and errors.
   The metric contains labels in the following format:
@@ -39,11 +39,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Changed
 
 - Metric `sharded_queue_calls` renamed to
-  `tnt_sharded_queue_api_statistics_calls_total` (#71). The metric now has
+  `tnt_sharded_queue_router_statistics_calls_total` (#71). The metric now has
   labels in the format `{name = "tube_name", state = "call_type"}` instead of
   `{name = "tube_name", status = "call_type"}`.
 - Metric `sharded_queue_tasks` renamed to
-  `tnt_sharded_queue_api_statistics_tasks` (#71). The metric now has labels
+  `tnt_sharded_queue_router_statistics_tasks` (#71). The metric now has labels
   in the format `{name = "tube_name", state = "task_state"}` instead of
   `{name = "tube_name", status = "task_state"}`.
 - The dependency `cartridge` is removed from the `rockspec` since the module

README.md

@@ -196,7 +196,7 @@ installed and the feature is not disabled by the configuration.
 
 ### Router (`roles.sharded-queue-router` or `sharded_queue.api` for the Cartridge)
 
-* Metric `tnt_sharded_queue_api_statistics_calls_total` is a counter with
+* Metric `tnt_sharded_queue_router_statistics_calls_total` is a counter with
   the number of requests broken down by [the type of request][queue-statistics].
   The metric has labels in the following format:
 
@@ -206,7 +206,7 @@ installed and the feature is not disabled by the configuration.
   `delete`, `touch`, `ack`, `release`. The metric on the `sharded_queue.api`
   role accumulates values from all buckets.
 
-* Metric `tnt_sharded_queue_api_statistics_tasks` is a gauge with
+* Metric `tnt_sharded_queue_router_statistics_tasks` is a gauge with
   the number of tasks in a queue broken down by [a task state][queue-statistics].
   The metric has labels in the following format:
 
@@ -216,7 +216,7 @@ installed and the feature is not disabled by the configuration.
   `delayed`, `total`. The metric on the `sharded_queue.api` role accumulates
   values from all buckets.
 
-* Metric `tnt_sharded_queue_api_role_stats` is a [summary][metrics-summary]
+* Metric `tnt_sharded_queue_router_role_stats` is a [summary][metrics-summary]
   with quantiles of `sharded_queue.api` role API calls. The metric includes a
   counter of API calls and errors and has labels in the following format:
 

sharded_queue/router/metrics.lua

@@ -13,7 +13,7 @@ local function enable(queue)
     local get_statistic = function(tube)
         return queue.statistics(tube)
     end
-    metrics_stats:enable('api', queue.map(), get_statistic)
+    metrics_stats:enable('router', queue.map(), get_statistic)
 end
 
 local function observe(latency, tube, method, ok)

test/metrics_test.lua

@@ -120,8 +120,8 @@ local function assert_metric(metrics, name, label, values, filters)
     end
 end
 
-g.test_metrics_api = function()
-    local tube_name = 'metrics_api_test'
+g.test_metrics_router = function()
+    local tube_name = 'metrics_router_test'
     helper.create_tube(tube_name)
     g.queue_conn = helper.get_evaler('queue-router')
 
@@ -137,10 +137,10 @@ g.test_metrics_api = function()
 
     -- Check metrics on the router.
     local metrics = get_router_metrics(tube_name)
-    assert_metric(metrics, "tnt_sharded_queue_api_role_stats_count", "method", {
+    assert_metric(metrics, "tnt_sharded_queue_router_role_stats_count", "method", {
         put = task_count,
     }, {status = "ok"})
-    assert_metric(metrics, "tnt_sharded_queue_api_statistics_calls_total", "state", {
+    assert_metric(metrics, "tnt_sharded_queue_router_statistics_calls_total", "state", {
         done = 0,
         take = 0,
         kick = 0,
@@ -151,16 +151,16 @@ g.test_metrics_api = function()
         ack = 0,
         release = 0,
     })
-    assert_metric(metrics, "tnt_sharded_queue_api_statistics_tasks", "state", {
+    assert_metric(metrics, "tnt_sharded_queue_router_statistics_tasks", "state", {
         ready = 0,
         taken = 0,
         done = 0,
         buried = 0,
         delayed = task_count,
         total = task_count,
     })
-    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_api_role_stats"), {})
-    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_api_role_stats_sum"), {})
+    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_router_role_stats"), {})
+    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_router_role_stats_sum"), {})
 
     -- Check metrics on storages.
     metrics = get_storages_metrics(tube_name)
@@ -191,8 +191,8 @@ g.test_metrics_api = function()
     t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_storage_role_stats_count"), {})
 end
 
-g.test_metrics_api_disabled = function()
-    local tube_name = 'metrics_api_disabled_test'
+g.test_metrics_router_disabled = function()
+    local tube_name = 'metrics_router_disabled_test'
     helper.set_cfg({metrics = false})
     helper.create_tube(tube_name)
 
@@ -210,23 +210,23 @@ g.test_metrics_api_disabled = function()
     t.assert_equals(get_metric(metrics, "tnt_sharded_queue_storage_role_stats_count"), {})
 end
 
-g.test_metrics_api_disable = function()
-    local tube_name = 'metrics_api_disable_test'
+g.test_metrics_router_disable = function()
+    local tube_name = 'metrics_router_disable_test'
     helper.create_tube(tube_name)
 
     g.queue_conn:call(utils.shape_cmd(tube_name, 'put'), {
         1, { delay = 3 , ttl = 3, ttr = 1}
     })
     local metrics = get_router_metrics(tube_name)
-    assert_metric(metrics, "tnt_sharded_queue_api_statistics_calls_total", "state", {
+    assert_metric(metrics, "tnt_sharded_queue_router_statistics_calls_total", "state", {
         put = 1,
     })
-    assert_metric(metrics, "tnt_sharded_queue_api_statistics_tasks", "state", {
+    assert_metric(metrics, "tnt_sharded_queue_router_statistics_tasks", "state", {
         delayed = 1,
     })
-    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_api_role_stats"), {})
-    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_api_role_stats_sum"), {})
-    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_api_role_stats_count"), {})
+    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_router_role_stats"), {})
+    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_router_role_stats_sum"), {})
+    t.assert_not_equals(get_metric(metrics, "tnt_sharded_queue_router_role_stats_count"), {})
 
     metrics = get_storages_metrics(tube_name)
     assert_metric(metrics, "tnt_sharded_queue_storage_statistics_calls_total", "state", {