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ScyllaDB Docs ScyllaDB C# driver Features Metrics List of metrics

List of metrics¶

In this section you can find a description of each metric type used by the driver and a list of all metrics provided by the driver.

Metric types¶

Metric Type

Description

Counter

Counters are atomic long values which can be incremented.

Gauge

A Gauge is simply an action that returns the instantaneous measure of a value, where the value abitrarily increases and decreases.

Meter

A Meter measures the rate at which an event occurs along with a total count of the occurances.

Timer

A Timer allows us to measure the duration of a type of event, the rate of its occurrence and provide duration statistics.

Session level metrics¶

Name

Type

C# Property

Description

connected-nodes

Gauge

SessionMetric.Gauges.ConnectedNodes

The number of nodes to which the driver has at least one active connection.

cql-client-timeouts

Counter

SessionMetric.Counters.CqlClientTimeouts

The number of timeouts in synchronous API calls like ISession.Execute() (related to QueryAbortTimeout).

bytes-received

Meter

SessionMetric.Meters.BytesReceived

The number and rate of bytes received for the entire session.

bytes-sent

Meter

SessionMetric.Meters.BytesSent

The number and rate of bytes sent for the entire session.

cql-requests

Timer

SessionMetric.Timers.CqlRequests

The throughput and latency percentiles of CQL requests (overall duration of the ISession.Execute() call).

Node level metrics¶

Name

Type

C# Property

Description

pool.open-connections

Gauge

NodeMetric.Gauges.OpenConnections

The number of connections open to this node for regular requests.

pool.in-flight

Gauge

NodeMetric.Gauges.InFlight

The number of requests currently executing on the connections to this node.

cql-messages

Timer

NodeMetric.Timers.CqlMessages

The throughput and latency percentiles of individual CQL messages sent to this node as part of an overall request.

bytes-sent

Meter

NodeMetric.Meters.BytesSent

The number and rate of bytes sent to this node.

bytes-received

Meter

NodeMetric.Meters.BytesReceived

The number and rate of bytes received from this node.

speculative-executions

Counter

NodeMetric.Counters.SpeculativeExecutions

The number of speculative executions triggered by a slow response from this node.

errors.connection.init

Counter

NodeMetric.Counters.ConnectionInitErrors

The number of errors encountered while trying to establish a connection to this node. Authentication errors are tracked separately in errors.connection.auth.

errors.connection.auth

Counter

NodeMetric.Counters.AuthenticationErrors

The number of authentication errors encountered while trying to establish a connection to this node.

errors.request.read-timeouts

Counter

NodeMetric.Counters.ReadTimeouts

The number of times this node replied with a READ_TIMEOUT error.

errors.request.write-timeouts

Counter

NodeMetric.Counters.WriteTimeouts

The number of times this node replied with a WRITE_TIMEOUT error.

errors.request.unavailables

Counter

NodeMetric.Counters.UnavailableErrors

The number of times this node replied with an UNAVAILABLE error.

errors.request.others

Counter

NodeMetric.Counters.OtherErrors

The number of times this node replied with a server error that doesn’t fall under other errors.request.* metrics.

errors.request.aborted

Counter

NodeMetric.Counters.AbortedRequests

The number of times a request was aborted before the driver even received a response from this node. Client timeouts are

errors.request.unsent

Counter

NodeMetric.Counters.UnsentRequests

The number of times the driver failed to send a request to this node.

errors.request.client-timeouts

Counter

NodeMetric.Counters.ClientTimeouts

The number of times the request failed due to a client-side timeout, when the client didn’t hear back from the server within SocketOptions.ReadTimeoutMillis. In this scenario, an OperationTimedOutException is thrown.

retries.read-timeout

Counter

NodeMetric.Counters.RetriesOnReadTimeout

The number of read timeout errors on this node that caused the RetryPolicy to trigger a retry.

retries.write-timeout

Counter

NodeMetric.Counters.RetriesOnWriteTimeout

The number of write timeout errors on this node that caused the RetryPolicy to trigger a retry.

retries.unavailable

Counter

NodeMetric.Counters.RetriesOnUnavailable

The number of unavailable errors on this node that caused the RetryPolicy to trigger a retry.

retries.other

Counter

NodeMetric.Counters.RetriesOnOtherError

The number of errors other than read timeouts, write timeouts and unavailable errors on this node that caused the RetryPolicy to trigger a retry.

retries.total

Counter

NodeMetric.Counters.Retries

The total number of retries triggered by the RetryPolicy.

ignores.read-timeout

Counter

NodeMetric.Counters.IgnoresOnReadTimeout

The number of read timeout errors on this node that were ignored by the RetryPolicy.

ignores.write-timeout

Counter

NodeMetric.Counters.IgnoresOnWriteTimeout

The number of write timeout errors on this node that were ignored by the RetryPolicy.

ignores.unavailable

Counter

NodeMetric.Counters.IgnoresOnUnavailable

The number of unavailable errors on this node that were ignored by the RetryPolicy.

ignores.other

Counter

NodeMetric.Counters.IgnoresOnOtherError

The number of errors other than read timeouts, write timeouts and unavailable errors on this node that were ignored by the RetryPolicy.

ignores.total

Counter

NodeMetric.Counters.Ignores

The total number of errors on this node that were ignored by the RetryPolicy.

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    • Metric types
    • Session level metrics
    • Node level metrics
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