Metrics#

Type#

enum class roq::metrics::Type#

Enumeration of metrics keys.

Values:

enumerator COUNTER#: Gateway specific.

enumerator INTER_PROCESS_LATENCY#: IPC latency between components (one-way)

enumerator LATENCY#: Exchange latency (transport or protocol level)

enumerator PROFILE#: Function profiling.

enumerator CLIENTS#: Connection events.

enumerator EVENTS#: Event profiling.

enumerator EXCEPTIONS#: Rejected order requests (counter)

enumerator HEARTBEAT_LATENCY#: Heartbeat latency between components.

enumerator PROCESS#: Process information.

enumerator ROUND_TRIP_LATENCY#: Tick-to-trade latency (round-trip, internal)

enumerator UPDATED#: State changes for connections (counter)

enumerator EVENT_LOG#: Event-log activity (counter)

enumerator MARKET_DATA_LATENCY#: Market data latency (one-way)

enumerator REQUEST_LATENCY#: Request latency (round-trip)

enumerator JOURNAL_LATENCY#: Journal latency (round-trip)

enumerator END_TO_END_LATENCY#: Latency between entry (origin) and exit (used by fix-bridge)

enumerator RATE_LIMITER#: Rate limiter (gauge)

Writer#

struct Writer#

Writer (Prometheus’ exposition format)

Public Functions

virtual Writer &write_type(std::string_view const &name, std::string_view const &type) = 0#: Write the TYPE header.

virtual Writer &write_simple(std::string_view const &name, std::string_view const &labels, uint64_t value) = 0#: Write simple metrics (counter and gauge)

virtual Writer &write_bucket(std::string_view const &name, std::string_view const &labels, double quantile, uint64_t value) = 0#: Write histogram buckets.

virtual Writer &write_sum(std::string_view const &name, std::string_view const &labels, double value) = 0#: Write histogram sum.

virtual Writer &write_count(std::string_view const &name, std::string_view const &labels, uint64_t count) = 0#: Write histogram count.

virtual Writer &finish() = 0#: Finish this metric.

template<typename T, typename ...Args> inline Writer &write(T const &collector, std::string_view const &name, Args&&... args)#: Dispatch helper.