Prometheus: add segment file count to queue_metrics and expose (backport #11245)

deps/rabbit/src/rabbit_osiris_metrics.erl

@@ -27,7 +27,8 @@
          members,
          memory,
          readers,
-         consumers
+         consumers,
+         segments
         ]).
 
 -record(state, {timeout :: non_neg_integer()}).

deps/rabbit/src/rabbit_stream_queue.erl

@@ -65,7 +65,7 @@
 -define(INFO_KEYS, [name, durable, auto_delete, arguments, leader, members, online, state,
                     messages, messages_ready, messages_unacknowledged, committed_offset,
                     policy, operator_policy, effective_policy_definition, type, memory,
-                    consumers]).
+                    consumers, segments]).
 
 -type appender_seq() :: non_neg_integer().
 
@@ -726,6 +726,14 @@ i(committed_offset, Q) ->
         Data ->
             maps:get(committed_offset, Data, '')
     end;
+i(segments, Q) ->
+    Key = {osiris_writer, amqqueue:get_name(Q)},
+    case osiris_counters:overview(Key) of
+        undefined ->
+            '';
+        Data ->
+            maps:get(segments, Data, '')
+    end;
 i(policy, Q) ->
     case rabbit_policy:name(Q) of
         none   -> '';

deps/rabbitmq_prometheus/src/collectors/prometheus_rabbitmq_core_metrics_collector.erl

@@ -160,7 +160,8 @@
         {2, undefined, queue_messages_paged_out_bytes, gauge, "Size in bytes of messages paged out to disk", message_bytes_paged_out},
         {2, undefined, queue_head_message_timestamp, gauge, "Timestamp of the first message in the queue, if any", head_message_timestamp},
         {2, undefined, queue_disk_reads_total, counter, "Total number of times queue read messages from disk", disk_reads},
-        {2, undefined, queue_disk_writes_total, counter, "Total number of times queue wrote messages to disk", disk_writes}
+        {2, undefined, queue_disk_writes_total, counter, "Total number of times queue wrote messages to disk", disk_writes},
+        {2, undefined, stream_segments, counter, "Total number of stream segment files", segments}
     ]},
 
 %%% Metrics that contain reference to a channel. Some of them also have
@@ -538,7 +539,7 @@ get_data(queue_consumer_count = MF, false, VHostsFilter, QueuesFilter) ->
                          end, empty(MF), Table),
     [{Table, [{consumers, A1}]}];
 get_data(queue_metrics = Table, false, VHostsFilter, QueuesFilter) ->
-    {Table, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16} =
+    {Table, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17} =
         ets:foldl(fun
                       ({#resource{kind = queue, virtual_host = VHost}, _, _}, Acc) when is_map(VHostsFilter), map_get(VHost, VHostsFilter) == false ->
                           Acc;
@@ -559,7 +560,7 @@ get_data(queue_metrics = Table, false, VHostsFilter, QueuesFilter) ->
                {messages_bytes_persistent, A9}, {message_bytes, A10},
                {message_bytes_ready, A11}, {message_bytes_unacknowledged, A12},
                {messages_paged_out, A13}, {message_bytes_paged_out, A14},
-               {disk_reads, A15}, {disk_writes, A16}]}];
+               {disk_reads, A15}, {disk_writes, A16}, {segments, A17}]}];
 get_data(Table, false, VHostsFilter, QueuesFilter) when Table == channel_exchange_metrics;
                            Table == queue_coarse_metrics;
                            Table == channel_queue_metrics;
@@ -668,7 +669,7 @@ get_data(Table, _, _, _) ->
 
 
 sum_queue_metrics(Props, {T, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11,
-                          A12, A13, A14, A15, A16}) ->
+                          A12, A13, A14, A15, A16, A17}) ->
     {T,
      sum(proplists:get_value(consumers, Props), A1),
      sum(proplists:get_value(consumer_utilisation, Props), A2),
@@ -685,7 +686,8 @@ sum_queue_metrics(Props, {T, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11,
      sum(proplists:get_value(messages_paged_out, Props), A13),
      sum(proplists:get_value(message_bytes_paged_out, Props), A14),
      sum(proplists:get_value(disk_reads, Props), A15),
-     sum(proplists:get_value(disk_writes, Props), A16)
+     sum(proplists:get_value(disk_writes, Props), A16),
+     sum(proplists:get_value(segments, Props), A17)
     }.
 
 division(0, 0) ->
@@ -707,7 +709,7 @@ empty(T) when T == ra_metrics ->
 empty(T) when T == channel_queue_metrics; T == channel_metrics ->
     {T, 0, 0, 0, 0, 0, 0, 0};
 empty(queue_metrics = T) ->
-    {T, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}.
+    {T, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}.
 
 sum(undefined, B) ->
     B;