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RFC-0084: Application Telemetry#140

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avsej wants to merge 39 commits intocouchbaselabs:mastercouchbaselabs/sdk-rfcs:masterfrom avsej:0084-app-service-level-telemetryavsej/sdk-rfcs:0084-app-service-level-telemetryCopy head branch name to clipboard

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Commits on Nov 11, 2024

• 0084-ApplicationTelemetry: Initial Draft

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Commits on Nov 20, 2024

• Update RFC in response to the review notes

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Commits on Dec 4, 2024

• Explicitly say that virtual/compound operations must not be tracked

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• Clarify that SDK should wait for app_telemetry_backoff when server does not respond to PING

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• Remove duplication of histogram buckets definition

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• Add the point about sending zero metrics

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Commits on Dec 12, 2024

• Clarified histogram value format

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• Explicitly note that the server might strip any tags

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• Relax requirement of the payload for GET_TELEMETRY request

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• Add not about _r_total

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• update parts about services the SDK should report

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• Add note that values of metrics must be integers

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• make it clear that histogram buckets are string literals

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Commits on Jan 14, 2025

• Remove id from the metric labels

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Commits on Jan 17, 2025

• Update the configuration key in Cluster Configuration JSON

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Commits on Jan 20, 2025

• Update according to recent discussions

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Commits on Feb 3, 2025

• add eventings into histogram table

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• restore alt_node label

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• Update statement about metrics and histogram bucket with zero values

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• declare options for PING: deadline and interval

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• update timestamps of the examples to milliseconds resolution

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• Note that the SDK must not collect the metrics if the feature disabled or not endpoint is not specified

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• Remove timestamps from the samples

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• use milliseconds for histograms to avoid rounding and floats

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• Explicitly say that transactions will be visible as unrelated subdoc operations

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• Add rule to decide which histogram for KV to use for given opcode

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• clarify why _total might differ from histogram _count

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• update histogram "le" labels to milliseconds

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• fix le="0.001" in the explanation of the labels

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• remove note about ParseFloat for _sum of histogram

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• Declare app_telemetry_ping_interval to be 30 seconds

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Commits on Feb 5, 2025

• rename duration_ms to duration_milliseconds

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• define histogram for management API

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Commits on Feb 7, 2025

• Enumerate services for counters

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Commits on Feb 8, 2025

• Rename app_telemetry_ping_deadline -> app_telemetry_ping_timeout

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Commits on Feb 11, 2025

• Mark alt_node label as optional

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• Add a note about labels for operations that timing out before receiving initial config.

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Commits on Feb 13, 2025

• Clarify classification of mutation/retrieval operations of KV

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• Note that it is the server should filter the empty-node_uuid metrics

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