Metrics

Generated from TaskMetricsMXBean by MetricsReferenceTest; do not edit by hand.

Each capture task registers one MXBean, sh.oso.cdc:type=task,server=<prefix>, where the prefix is cdc.topic.prefix. The JMX Prometheus exporter configuration in ops/jmx-exporter/oracle-cdc.yml publishes every numeric attribute under the name below with a server label. A Grafana dashboard (ops/grafana/oracle-cdc-connector.json) and Prometheus alert rules (ops/alerts/prometheus-rules.yaml) use these names.

Attribute	Prometheus name	Kind	Description
BufferHeapBytes	oracle_cdc_buffer_heap_bytes	gauge	Estimated heap bytes held by open transactions.
BufferMemoryMaxBytes	oracle_cdc_buffer_memory_max_bytes	gauge	cdc.buffer.memory.max.bytes, for ratio alerts.
BufferedEvents	oracle_cdc_buffered_events	gauge	Changes held for open transactions, on heap and spilled.
DecodeFailures	oracle_cdc_decode_failures_total	counter	Rows that could not be decoded and went to the DLQ (cdc.on.decode.error=dlq).
DlqRecords	oracle_cdc_dlq_records_total	counter	DLQ records queued.
EventsApplied	oracle_cdc_events_applied_total	counter	Mining events applied to the transaction buffer.
HeartbeatsSent	oracle_cdc_heartbeats_sent_total	counter	Heartbeat records queued.
IdlePolls	oracle_cdc_idle_polls_total	counter	Polls that found no new redo.
JournalChunks	oracle_cdc_journal_chunks_total	counter	Transaction journal chunks queued.
JournalTombstones	oracle_cdc_journal_tombstones_total	counter	Transaction journal tombstones queued.
JournaledTransactions	oracle_cdc_journaled_transactions	gauge	Open transactions written to the transaction journal.
LagReplays	oracle_cdc_lag_replays_total	counter	Steps mined again with a dictionary from the redo because rows predate a later DDL (the lag case).
LargestTransactions	not exported (composite)	table	The 20 largest open transactions by bytes buffered.
LastCommitTimestampMillis	oracle_cdc_last_commit_timestamp_millis	gauge	Commit time of the last transaction queued, epoch milliseconds, or -1.
LastStepMillis	oracle_cdc_last_step_millis	gauge	Duration of the last mining step, in milliseconds.
LobInsertsMerged	oracle_cdc_lob_inserts_merged_total	counter	LOB locator updates folded into their INSERT.
LobRowsApplied	oracle_cdc_lob_rows_applied_total	counter	LOB_WRITE, LOB_TRIM and LOB_ERASE rows applied.
MillisBehindSource	oracle_cdc_millis_behind_source	gauge	Time between the commit of the last transaction queued and its queueing, in milliseconds.
MinedToScn	oracle_cdc_mined_to_scn	gauge	SCN the engine has mined up to.
OldestOpenScn	oracle_cdc_oldest_open_scn	gauge	First SCN of the oldest open transaction that is not journaled, or -1; the resume position cannot pass it.
OpenTransactions	oracle_cdc_open_transactions	gauge	Transactions open in the buffer.
OpsEvents	oracle_cdc_ops_events_total	counter	Ops topic events queued.
OrphansReleased	oracle_cdc_orphans_released_total	counter	Open transactions released by orphan detection.
QueueDepth	oracle_cdc_queue_depth	gauge	Records waiting for Kafka Connect to poll.
Reconnects	oracle_cdc_reconnects_total	counter	Reconnections after a transient database error (CDC-1001).
RolledBackTransactions	oracle_cdc_rolled_back_transactions_total	counter	Transactions rolled back while buffered.
RowsMined	oracle_cdc_rows_mined_total	counter	Rows returned by LogMiner, including rows for other tables in the same logs and transaction control rows.
SafeEndScn	oracle_cdc_safe_end_scn	gauge	Database SCN read at the last step: the end of what can be mined.
ScnLag	oracle_cdc_scn_lag	gauge	SafeEndScn minus MinedToScn.
SessionRecycles	oracle_cdc_session_recycles_total	counter	LogMiner sessions restarted at cdc.mining.session.max.age.ms.
SnapshotChunkRetries	oracle_cdc_snapshot_chunk_retries_total	counter	Snapshot chunks read again after an error, with a fresh SCN.
SnapshotChunksPending	oracle_cdc_snapshot_chunks_pending	gauge	Snapshot chunks read and waiting for streaming to pass their SCN.
SnapshotChunksPublished	oracle_cdc_snapshot_chunks_published_total	counter	Snapshot chunks published, after streaming passed their SCN.
SnapshotChunksRead	oracle_cdc_snapshot_chunks_read_total	counter	Snapshot chunks read.
SnapshotRowsPublished	oracle_cdc_snapshot_rows_published_total	counter	Snapshot rows published as op=r records.
SnapshotTablesRemaining	oracle_cdc_snapshot_tables_remaining	gauge	Tables the running snapshot has still to read.
SpillMaxBytes	oracle_cdc_spill_max_bytes	gauge	cdc.buffer.spill.max.bytes, for ratio alerts.
SpilledBytes	oracle_cdc_spilled_bytes	gauge	Bytes in spill files.
SpilledTransactions	oracle_cdc_spilled_transactions	gauge	Open transactions spilled to disk.
StepCuts	oracle_cdc_step_cuts_total	counter	Steps cut after a DDL that changed the captured object ids.
StepRetries	oracle_cdc_step_retries_total	counter	Steps discarded and mined again after a retriable LogMiner error (CDC-1002).
StepTimeouts	oracle_cdc_step_timeouts_total	counter	Steps cancelled at cdc.mining.query.timeout.ms; the next step covers fewer logs.
Steps	oracle_cdc_steps_total	counter	Mining steps applied.
TransactionsCommitted	oracle_cdc_transactions_committed_total	counter	Committed transactions handed to the sink.
TransactionsDiscarded	oracle_cdc_transactions_discarded_total	counter	Transactions dropped by cdc.transaction.max.age.action=discard.
TransactionsSkipped	oracle_cdc_transactions_skipped_total	counter	Committed transactions already delivered before a restart, skipped whole.
UndoneEvents	oracle_cdc_undone_events_total	counter	Changes removed or downgraded by savepoint and statement rollbacks.
UnmatchedUndo	oracle_cdc_unmatched_undo_total	counter	Undo rows that matched no buffered change.
WindowLogs	oracle_cdc_window_logs	gauge	Redo logs in the last step's window.