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Copy new analytics docs to 4.6
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‎versioned_docs/version-4.6/technical-details/reference/analytics.md‎

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@@ -102,16 +102,72 @@ And a summary record looks like:
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```
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The following are general resource usage statistics that are tracked:
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- `memory` - This includes RSS, heap, buffer and external data usage.
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- `utilization` - How much of the time the worker was processing requests.
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- mqtt-connections - The number of MQTT connections.
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# Standard Analytics Metrics
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While applications can define their own metrics, Harper provides a set of standard metrics that are tracked for all services:
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## HTTP
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The following metrics are tracked for all HTTP requests:
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| `metric` | `path` | `method` | `type` | Unit | Description |
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| ------------------ | ------------- | -------------- | ---------------------------------------------- | ------------ | ------------------------------------------------------- |
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| `duration` | resource path | request method | `cache-hit` or `cache-miss` if a caching table | milliseconds | Duration of request handler |
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| `duration` | route path | request method | fastify-route | milliseconds | |
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| `duration` | operation | | operation | milliseconds | |
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| `success` | resource path | request method | | % | |
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| `success` | route path | request method | fastify-route | % | |
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| `success` | operation | | operation | % | |
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| `bytes-sent` | resource path | request method | | bytes | |
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| `bytes-sent` | route path | request method | fastify-route | bytes | |
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| `bytes-sent` | operation | | operation | bytes | |
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| `transfer` | resource path | request method | operation | milliseconds | duration of transfer |
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| `transfer` | route path | request method | fastify-route | milliseconds | duration of transfer |
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| `transfer` | operation | | operation | milliseconds | duration of transfer |
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| `socket-routed` | | | | % | percentage of sockets that could be immediately routed |
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| `tls-handshake` | | | | milliseconds | |
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| `tls-reused` | | | | % | percentage of TLS that reuses sessions |
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| `cache-hit` | table name | | | % | The percentage of cache hits |
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| `cache-resolution` | table name | | | milliseconds | The duration of resolving requests for uncached entries |
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The following are metrics for real-time MQTT connections:
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| `metric` | `path` | `method` | `type` | Unit | Description |
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|--------------------|---------------|----------------|--------------------------------------------|--------------------------------------------------------|---------------------------------------------------------|
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| `mqtt-connections` | | | | count | The number of open direct MQTT connections |
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| `ws-connections` | | | | count | number of open WS connections|
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| `connection` | `mqtt` | `connect` | | % | percentage of successful direct MQTT connections |
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| `connection` | `mqtt` | `disconnect` | | % | percentage of explicit direct MQTT disconnects |
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| `connection` | `ws` | `connect` | | % | percentage of successful WS connections |
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| `connection` | `ws` | `disconnect` | | % | percentage of explicit WS disconnects |
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| `bytes-sent` | topic | mqtt command | `mqtt` | bytes | The number of bytes sent for a given command and topic |
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The following are metrics for replication:
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| `metric` | `path` | `method` | `type` | Unit | Description |
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| ---------------- | ------------- | ------------- | --------- | ----- | ----------------------------------------------------- |
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| `bytes-sent` | node.database | `replication` | `egress` | bytes | The number of bytes sent for replication |
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| `bytes-sent` | node.database | `replication` | `blob` | bytes | The number of bytes sent for replication of blobs |
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| `bytes-received` | node.database | `replication` | `ingress` | bytes | The number of bytes received for replication |
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| `bytes-received` | node.database | `replication` | `blob` | bytes | The number of bytes received for replication of blobs |
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The following types of information is tracked for each HTTP request:
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- `success` - How many requests returned a successful response (20x response code). TTFB - Time to first byte in the response to the client.
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- `transfer` - Time to finish the transfer of the data to the client.
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- bytes-sent - How many bytes of data were sent to the client.
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The following are general resource usage statistics that are tracked:
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Requests are categorized by operation name, for the operations API, by the resource (name) with the REST API, and by command for the MQTT interface.
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| `metric` | primary attribute(s) | other attribute(s) | Unit | Description |
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| ------------------------- | ------------------------------------------------------------------------------------------------ | ------------------- | ------- | ----------------------------------------------------------------------------------------------------------------------------- |
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| `database-size` | `size`, `used`, `free`, `audit` | `database` | bytes | The size of the database in bytes |
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| `main-thread-utilization` | `idle`, `active`, `taskQueueLatency`, `rss`, `heapTotal`, `heapUsed`, `external`, `arrayBuffers` | `time` | various | Main thread resource usage; including idle time, active time, task queue latency, RSS, heap, buffer and external memory usage |
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| `resource-usage` | | | various | [See breakout below](#resource-usage) |
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| `storage-volume` | `available`, `free`, `size` | `database` | bytes | The size of the storage volume in bytes |
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| `table-size` | `size` | `database`, `table` | bytes | The size of the table in bytes |
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| `utilization` | | | % | How much of the time the worker was processing requests |
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<a id="resource-usage"></a>
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`resource-usage` metrics are everything returned by [node:process.resourceUsage()](https://nodejs.org/api/process.html#processresourceusage)[^1] plus the following additional metrics:
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| `metric` | Unit | Description |
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| ---------------- | ---- | ----------------------------------------------------- |
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| `time` | ms | Current time when metric was recorded (Unix time) |
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| `period` | ms | Duration of the metric period |
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| `cpuUtilization` | % | CPU utilization percentage (user and system combined) |
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[^1]: The `userCPUTime` and `systemCPUTime` metrics are converted to milliseconds to match the other time-related metrics.

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