Every series memo-mcp exposes, as of v1.4. Types: C counter, G gauge, H histogram.
A histogram exposes _bucket{le}, _sum and _count. A family with no observations yet
shows only its # HELP and # TYPE lines.
Bucket sets:
Set Boundaries
latency (s) 0.001, 0.0025, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10 tokens 50, 100, 200, 500, 1000, 2000, 4000, 8000, 16000 count 0, 1, 2, 5, 10, 20, 50, 100, 200, 500 bytes 1 KiB, 4 KiB, 16 KiB, 64 KiB, 256 KiB, 1 MiB, 4 MiB
Metric Type Labels Meaning
memo_mcp_requests_totalC method, outcome = ok, errorEvery MCP request received (tools/call, resources/read, server/discover, …) memo_mcp_requests_in_flightG — Requests being served now memo_mcp_tool_calls_totalC tool, outcome = ok, tool_error, input_required, errorTool calls. input_required is promote waiting for a human memo_mcp_tool_call_duration_secondsH latency toolTool call latency memo_mcp_tool_result_tokensH tokens toolEstimated tokens in each tool result: the cost the agent pays memo_mcp_tool_errors_totalC tool, class = not_found, forgotten, needs_human, canceled, invalid_args, internalWhy calls failed memo_mcp_elicitations_totalC tool, outcome = asked, accept, decline, cancel, unsupportedHuman approval dialogs memo_mcp_resource_reads_totalC kind = doc, chunk, source, fact, entity, page, index, ns_index, unknown; outcome = ok, errormemo:// resource readsmemo_mcp_sessions_totalC clientSessions started, by client name
Metric Type Labels Meaning
memo_search_totalC mode_requested, mode_resolved, granularity, outcome = results, abstainSearches that completed (failed searches show up as tool errors) memo_search_duration_secondsH latency granularityEnd-to-end search latency memo_search_arm_duration_secondsH latency armTime in each retrieval arm memo_search_arm_candidatesH count armCandidates each arm returned before fusion memo_search_resultsH count granularityResults returned per search memo_search_truncated_results_totalC — Ranked results left out by the token budget memo_search_cutoff_totalC kind = gap, budget, limit, noneWhy lists ended memo_search_degraded_totalC reason = no_embedder, query_embed_failed, reranker_failed, otherSearches served without a capability memo_search_abstentions_totalC reasonSearches that returned nothing on purpose memo_search_entities_matchedH count — Known entities named per query memo_search_rerank_duration_secondsH latency modelCross-encoder time, only with the reranker memo_graph_cache_totalC event = hit, build, build_asofIn-memory mention-graph cache memo_graph_build_duration_secondsH latency — Time to build a namespace graph
Metric Type Labels Meaning
memo_store_writes_totalC op, channel = tool, cli, elicitation, workerEvery audited write memo_store_ingests_totalC outcome = new, revision, dedup, errorIngest calls memo_store_ingest_duration_secondsH latency — Ingest latency, embedding included memo_store_chunks_written_totalC — Passages written memo_store_document_bytesH bytes — Size of ingested documents memo_store_vectors_stored_totalC modelVectors stored memo_store_embed_batches_totalC outcome = ok, error, queuedEmbedding batches on the write path memo_store_jobs_totalC kind, event = queued, done, failedBackground jobs, for example the embed backlog memo_store_mentions_linked_totalC — Entity mentions linked to passages memo_store_pages_marked_stale_totalC — Pages marked stale by a source change or forget memo_store_work_items_totalC kind, event = created, done, skippedCompaction work items memo_store_status_scrape_errors_totalC — Failures reading the gauges below
Metric Labels Meaning
memo_kb_sources— Sources memo_kb_documents_live— Live documents (latest revision, not forgotten) memo_kb_revisions— Document revisions stored memo_kb_chunks— Live passages memo_kb_facts— Live facts memo_kb_entities— Entities memo_kb_mentions— Entity mentions memo_kb_edges— Typed edges memo_kb_merge_review_open— Open merge candidates awaiting a human memo_kb_pages— Curated pages memo_kb_pages_stale— Stale pages memo_kb_work_items_open— Open compaction work items memo_kb_jobs_queued— Jobs queued or running memo_kb_jobs_failed— Jobs failed memo_kb_pending_embeddingsmodelPassages without a vector for that model memo_kb_schema_version— Schema version of the file memo_kb_db_size_bytes— Size of the main SQLite file, excluding the WAL memo_kb_last_write_timestamp_seconds— Unix time of the last audited write memo_kb_namespace_documentsnamespaceLive documents per namespace memo_kb_namespace_chunksnamespaceLive passages per namespace
All are gauges.
Metric Type Labels Meaning
memo_embed_duration_secondsH latency model, role = query, docEmbedding call latency memo_embed_texts_totalC model, roleTexts embedded memo_embed_errors_totalC model, roleEmbedding calls that failed memo_embed_batch_sizeH count modelTexts per call memo_embed_model_downloads_totalC model, outcome = ok, error, corrupt_retryModel downloads memo_embed_model_load_secondsG modelTime the last model load took memo_embed_model_loadedG model, backend = hugot, static1 while a model is loaded in this process
Metric Type Labels Meaning
memo_ui_requests_totalC route (for example GET /search), statusUI requests memo_ui_request_duration_secondsH latency routeUI render time
Metric Type Labels Meaning
memo_build_infoG (always 1) version, go_version, mcp_protocol, goos, goarchWhat is running go_infoG versionGo version go_goroutinesG — Goroutines go_memstats_heap_alloc_bytesG — Live heap go_memstats_sys_bytesG — Memory obtained from the OS go_gc_cycles_totalC — Completed GC cycles go_gc_pauses_secondsH — GC pause distribution process_start_time_secondsG — Process start time; use it to spot session restarts