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# Which Problems Are Solved Right now we have no visibility into river queue's job processing times and queue sizes. This makes it difficult to reliably know if notifications are actually being published in a reasonable time and current queue size. # How the Problems Are Solved Integrates River's OpenTelemetry middleware with Zitadel's metrics system by adding the otelriver middleware to the queue configuration. # Additional Changes - Updated dependencies to include required `otelriver` package # Additional Context Example output from `/debug/metrics` <details> <summary>output</summary> # HELP failed_deliveries_json_total Failed JSON message deliveries # TYPE failed_deliveries_json_total counter failed_deliveries_json_total{otel_scope_name="",otel_scope_version="",triggering_event_type="user.human.phone.code.added"} 2 # HELP go_gc_duration_seconds A summary of the wall-time pause (stop-the-world) duration in garbage collection cycles. # TYPE go_gc_duration_seconds summary go_gc_duration_seconds{quantile="0"} 3.8e-05 go_gc_duration_seconds{quantile="0.25"} 6.3916e-05 go_gc_duration_seconds{quantile="0.5"} 7.5584e-05 go_gc_duration_seconds{quantile="0.75"} 9.2584e-05 go_gc_duration_seconds{quantile="1"} 0.000204292 go_gc_duration_seconds_sum 0.003028502 go_gc_duration_seconds_count 34 # HELP go_gc_gogc_percent Heap size target percentage configured by the user, otherwise 100. This value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent function. Sourced from /gc/gogc:percent # TYPE go_gc_gogc_percent gauge go_gc_gogc_percent 100 # HELP go_gc_gomemlimit_bytes Go runtime memory limit configured by the user, otherwise math.MaxInt64. This value is set by the GOMEMLIMIT environment variable, and the runtime/debug.SetMemoryLimit function. Sourced from /gc/gomemlimit:bytes # TYPE go_gc_gomemlimit_bytes gauge go_gc_gomemlimit_bytes 9.223372036854776e+18 # HELP go_goroutines Number of goroutines that currently exist. # TYPE go_goroutines gauge go_goroutines 231 # HELP go_info Information about the Go environment. # TYPE go_info gauge go_info{version="go1.24.3"} 1 # HELP go_memstats_alloc_bytes Number of bytes allocated in heap and currently in use. Equals to /memory/classes/heap/objects:bytes. # TYPE go_memstats_alloc_bytes gauge go_memstats_alloc_bytes 7.7565832e+07 # HELP go_memstats_alloc_bytes_total Total number of bytes allocated in heap until now, even if released already. Equals to /gc/heap/allocs:bytes. # TYPE go_memstats_alloc_bytes_total counter go_memstats_alloc_bytes_total 7.3319844e+08 # HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table. Equals to /memory/classes/profiling/buckets:bytes. # TYPE go_memstats_buck_hash_sys_bytes gauge go_memstats_buck_hash_sys_bytes 1.63816e+06 # HELP go_memstats_frees_total Total number of heap objects frees. Equals to /gc/heap/frees:objects + /gc/heap/tiny/allocs:objects. # TYPE go_memstats_frees_total counter go_memstats_frees_total 1.1496925e+07 # HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata. Equals to /memory/classes/metadata/other:bytes. # TYPE go_memstats_gc_sys_bytes gauge go_memstats_gc_sys_bytes 5.182776e+06 # HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and currently in use, same as go_memstats_alloc_bytes. Equals to /memory/classes/heap/objects:bytes. # TYPE go_memstats_heap_alloc_bytes gauge go_memstats_heap_alloc_bytes 7.7565832e+07 # HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used. Equals to /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes. # TYPE go_memstats_heap_idle_bytes gauge go_memstats_heap_idle_bytes 5.8179584e+07 # HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes # TYPE go_memstats_heap_inuse_bytes gauge go_memstats_heap_inuse_bytes 8.5868544e+07 # HELP go_memstats_heap_objects Number of currently allocated objects. Equals to /gc/heap/objects:objects. # TYPE go_memstats_heap_objects gauge go_memstats_heap_objects 573723 # HELP go_memstats_heap_released_bytes Number of heap bytes released to OS. Equals to /memory/classes/heap/released:bytes. # TYPE go_memstats_heap_released_bytes gauge go_memstats_heap_released_bytes 7.20896e+06 # HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes + /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes. # TYPE go_memstats_heap_sys_bytes gauge go_memstats_heap_sys_bytes 1.44048128e+08 # HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection. # TYPE go_memstats_last_gc_time_seconds gauge go_memstats_last_gc_time_seconds 1.749491558214289e+09 # HELP go_memstats_mallocs_total Total number of heap objects allocated, both live and gc-ed. Semantically a counter version for go_memstats_heap_objects gauge. Equals to /gc/heap/allocs:objects + /gc/heap/tiny/allocs:objects. # TYPE go_memstats_mallocs_total counter go_memstats_mallocs_total 1.2070648e+07 # HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures. Equals to /memory/classes/metadata/mcache/inuse:bytes. # TYPE go_memstats_mcache_inuse_bytes gauge go_memstats_mcache_inuse_bytes 16912 # HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system. Equals to /memory/classes/metadata/mcache/inuse:bytes + /memory/classes/metadata/mcache/free:bytes. # TYPE go_memstats_mcache_sys_bytes gauge go_memstats_mcache_sys_bytes 31408 # HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures. Equals to /memory/classes/metadata/mspan/inuse:bytes. # TYPE go_memstats_mspan_inuse_bytes gauge go_memstats_mspan_inuse_bytes 1.3496e+06 # HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system. Equals to /memory/classes/metadata/mspan/inuse:bytes + /memory/classes/metadata/mspan/free:bytes. # TYPE go_memstats_mspan_sys_bytes gauge go_memstats_mspan_sys_bytes 2.18688e+06 # HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place. Equals to /gc/heap/goal:bytes. # TYPE go_memstats_next_gc_bytes gauge go_memstats_next_gc_bytes 1.34730994e+08 # HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations. Equals to /memory/classes/other:bytes. # TYPE go_memstats_other_sys_bytes gauge go_memstats_other_sys_bytes 3.125168e+06 # HELP go_memstats_stack_inuse_bytes Number of bytes obtained from system for stack allocator in non-CGO environments. Equals to /memory/classes/heap/stacks:bytes. # TYPE go_memstats_stack_inuse_bytes gauge go_memstats_stack_inuse_bytes 2.752512e+06 # HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator. Equals to /memory/classes/heap/stacks:bytes + /memory/classes/os-stacks:bytes. # TYPE go_memstats_stack_sys_bytes gauge go_memstats_stack_sys_bytes 2.752512e+06 # HELP go_memstats_sys_bytes Number of bytes obtained from system. Equals to /memory/classes/total:byte. # TYPE go_memstats_sys_bytes gauge go_memstats_sys_bytes 1.58965032e+08 # HELP go_sched_gomaxprocs_threads The current runtime.GOMAXPROCS setting, or the number of operating system threads that can execute user-level Go code simultaneously. Sourced from /sched/gomaxprocs:threads # TYPE go_sched_gomaxprocs_threads gauge go_sched_gomaxprocs_threads 14 # HELP go_threads Number of OS threads created. # TYPE go_threads gauge go_threads 25 # HELP grpc_server_grpc_status_code_total Grpc status code counter # TYPE grpc_server_grpc_status_code_total counter grpc_server_grpc_status_code_total{grpc_method="/zitadel.management.v1.ManagementService/ListUserChanges",otel_scope_name="",otel_scope_version="",return_code="200"} 1 grpc_server_grpc_status_code_total{grpc_method="/zitadel.management.v1.ManagementService/ListUserMetadata",otel_scope_name="",otel_scope_version="",return_code="200"} 2 grpc_server_grpc_status_code_total{grpc_method="/zitadel.management.v1.ManagementService/ResendHumanPhoneVerification",otel_scope_name="",otel_scope_version="",return_code="200"} 1 grpc_server_grpc_status_code_total{grpc_method="/zitadel.user.v2.UserService/GetUserByID",otel_scope_name="",otel_scope_version="",return_code="200"} 1 # HELP grpc_server_request_counter_total Grpc request counter # TYPE grpc_server_request_counter_total counter grpc_server_request_counter_total{grpc_method="/zitadel.management.v1.ManagementService/ListUserChanges",otel_scope_name="",otel_scope_version=""} 1 grpc_server_request_counter_total{grpc_method="/zitadel.management.v1.ManagementService/ListUserMetadata",otel_scope_name="",otel_scope_version=""} 2 grpc_server_request_counter_total{grpc_method="/zitadel.management.v1.ManagementService/ResendHumanPhoneVerification",otel_scope_name="",otel_scope_version=""} 1 grpc_server_request_counter_total{grpc_method="/zitadel.user.v2.UserService/GetUserByID",otel_scope_name="",otel_scope_version=""} 1 # HELP grpc_server_total_request_counter_total Total grpc request counter # TYPE grpc_server_total_request_counter_total counter grpc_server_total_request_counter_total{otel_scope_name="",otel_scope_version=""} 5 # HELP otel_scope_info Instrumentation Scope metadata # TYPE otel_scope_info gauge otel_scope_info{otel_scope_name="",otel_scope_version=""} 1 otel_scope_info{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version=""} 1 # HELP projection_events_processed_total Number of events reduced to process projection updates # TYPE projection_events_processed_total counter projection_events_processed_total{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",success="true"} 1 projection_events_processed_total{otel_scope_name="",otel_scope_version="",projection="projections.instance_features2",success="true"} 0 projection_events_processed_total{otel_scope_name="",otel_scope_version="",projection="projections.login_names3",success="true"} 0 projection_events_processed_total{otel_scope_name="",otel_scope_version="",projection="projections.notifications",success="true"} 1 projection_events_processed_total{otel_scope_name="",otel_scope_version="",projection="projections.orgs1",success="true"} 0 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projection_handle_timer_seconds_count{otel_scope_name="",otel_scope_version="",projection="projections.notifications"} 1 # HELP projection_state_latency_seconds When finishing processing a batch of events, this track the age of the last events seen from current time # TYPE projection_state_latency_seconds histogram projection_state_latency_seconds_bucket{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",le="0.1"} 1 projection_state_latency_seconds_bucket{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",le="0.5"} 1 projection_state_latency_seconds_bucket{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",le="1"} 1 projection_state_latency_seconds_bucket{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",le="5"} 1 projection_state_latency_seconds_bucket{otel_scope_name="",otel_scope_version="",projection="projections.execution_handler",le="10"} 1 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TYPE promhttp_metric_handler_requests_in_flight gauge promhttp_metric_handler_requests_in_flight 1 # HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code. # TYPE promhttp_metric_handler_requests_total counter promhttp_metric_handler_requests_total{code="200"} 1 promhttp_metric_handler_requests_total{code="500"} 0 promhttp_metric_handler_requests_total{code="503"} 0 # HELP river_insert_count_total Number of jobs inserted # TYPE river_insert_count_total counter river_insert_count_total{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok"} 1 # HELP river_insert_many_count_total Number of job batches inserted (all jobs are inserted in a batch, but batches may be one job) # TYPE river_insert_many_count_total counter river_insert_many_count_total{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok"} 1 # HELP river_insert_many_duration_histogram_seconds Duration of job batch insertion (histogram) # TYPE river_insert_many_duration_histogram_seconds histogram river_insert_many_duration_histogram_seconds_bucket{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok",le="0"} 0 river_insert_many_duration_histogram_seconds_bucket{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok",le="5"} 1 river_insert_many_duration_histogram_seconds_bucket{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok",le="10"} 1 river_insert_many_duration_histogram_seconds_bucket{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok",le="25"} 1 river_insert_many_duration_histogram_seconds_bucket{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok",le="50"} 1 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river_insert_many_duration_histogram_seconds_count{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok"} 1 # HELP river_insert_many_duration_seconds Duration of job batch insertion # TYPE river_insert_many_duration_seconds gauge river_insert_many_duration_seconds{otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",status="ok"} 0.002905666 # HELP river_work_count_total Number of jobs worked # TYPE river_work_count_total counter river_work_count_total{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 1 river_work_count_total{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 1 # HELP river_work_duration_histogram_seconds Duration of job being worked 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river_work_duration_histogram_seconds_bucket{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="2500"} 1 river_work_duration_histogram_seconds_bucket{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="5000"} 1 river_work_duration_histogram_seconds_bucket{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="7500"} 1 river_work_duration_histogram_seconds_bucket{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="10000"} 1 river_work_duration_histogram_seconds_bucket{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="+Inf"} 1 river_work_duration_histogram_seconds_sum{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 0.029241083 river_work_duration_histogram_seconds_count{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="0"} 0 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river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="750"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="1000"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="2500"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="5000"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="7500"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="10000"} 1 river_work_duration_histogram_seconds_bucket{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]",le="+Inf"} 1 river_work_duration_histogram_seconds_sum{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 0.0408745 river_work_duration_histogram_seconds_count{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 1 # HELP river_work_duration_seconds Duration of job being worked # TYPE river_work_duration_seconds gauge river_work_duration_seconds{attempt="1",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 0.029241083 river_work_duration_seconds{attempt="2",kind="notification_request",otel_scope_name="github.com/riverqueue/rivercontrib/otelriver",otel_scope_version="",priority="1",queue="notification",status="error",tag="[]"} 0.0408745 # HELP target_info Target metadata # TYPE target_info gauge target_info{service_name="ZITADEL",service_version="2025-06-09T13:52:29-04:00",telemetry_sdk_language="go",telemetry_sdk_name="opentelemetry",telemetry_sdk_version="1.35.0"} 1 </details> Example grafana dashboard:  - Closes #10043 --------- Co-authored-by: Silvan <27845747+adlerhurst@users.noreply.github.com>