[#360] Added epoch metrics test

Signed-off-by: Ilyas Niyazov <i.niyazov@yadro.com>

pytest_tests/testsuites/metrics/test_epoch_metrics.py

@@ -0,0 +1,40 @@
+import allure
+from frostfs_testlib.testing import parallel
+import pytest
+from frostfs_testlib import reporter
+from frostfs_testlib.steps.metrics import get_metrics_value
+from frostfs_testlib.storage.cluster import ClusterNode
+from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
+
+
+@pytest.mark.order(-11)
+@pytest.mark.nightly
+@pytest.mark.metrics
+class TestEpochMetrics(ClusterTestBase):
+    @reporter.step("Get metrics value from node: {node}")
+    def get_metrics_search_by_greps_parallel(self, node: ClusterNode, **greps):
+        try:
+            return get_metrics_value(node, parse_from_command=True, **greps)
+        except Exception as e:
+            return None
+
+    @allure.title("Check changes in metric frostfs_node_ir_epoch value")
+    def test_check_increase_epoch_metric(self):
+        metric_name = "frostfs_node_ir_epoch"
+        with reporter.step("Get current value of metric: {metric_name} from each nodes"):
+            futures = parallel(self.get_metrics_search_by_greps_parallel, self.cluster.cluster_nodes, command=metric_name)
+            metrics_results = [future.result() for future in futures if future.result() is not None]
+
+        with reporter.step("Check that the metric values are the same in all nodes"):
+            assert len(set(metrics_results)) == 1, f"Metric {metric_name} values aren't same in all nodes"
+            assert len(metrics_results) == len(self.cluster.cluster_nodes), "Metrics are not available in some nodes"
+        
+        with reporter.step("Tick epoch"):
+            self.tick_epoch(wait_block=2)
+  
+        with reporter.step('Check that metric value increase'):
+            futures = parallel(self.get_metrics_search_by_greps_parallel, self.cluster.cluster_nodes, command=metric_name)
+            new_metrics_results = [future.result() for future in futures if future.result() is not None]
+
+            assert len(set(new_metrics_results)) == 1, f"Metric {metric_name} values aren't same in all nodes"
+            assert new_metrics_results[0] > metrics_results[0], "Metric value doesn't increased"