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55854: server,docgen: enhance the API documentation r=taroface a=knz Informs cockroachdb/docs#8602 This commit makes three changes: - it extends the API doc generator to recognize annotations to distinguish “reserved”, “alpha” and “public” APIs and report this level of support in the generated output. [Example full output here](https://github.com/knz/cockroach/blob/20201022-nodes/docs/generated/http/full.md) - it makes it possible to annotate different levels of support for different fields inside a single API payload. This makes it possible to document that certain fields of public APIs are “reserved”. - it marks all the APIs as “reserved” except for the following three: - `/health` which has been stabilized and is safely documentable. [See doc here](https://github.com/knz/cockroach/blob/20201022-nodes/docs/generated/http/full.md#health) - `/_status/nodes` ([generated doc](https://github.com/knz/cockroach/blob/20201022-nodes/docs/generated/http/full.md#nodes)) and `/_status/hotranges` ([generated doc](https://github.com/knz/cockroach/blob/20201022-nodes/docs/generated/http/full.md#hotranges)) are marked as “alpha” as requested by @piyush-singh, to serve as example of how we could document an API. Note that some other API endpoints could probably be marked as “alpha” but the upcoming release cycle will see the introduction of a new namespace for public APIs, so we wish to not over-commit at this time. Release note: None Co-authored-by: Raphael 'kena' Poss <knz@thaumogen.net>
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| <a name="cockroach.server.serverpb.HealthRequest"></a> | ||
| #### HealthRequest | ||
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| HealthRequest requests a liveness or readiness check. | ||
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| A liveness check is triggered via ready set to false. In this mode, | ||
| an empty response is returned immediately, that is, the caller merely | ||
| learns that the process is running. | ||
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| A readiness check (ready == true) is suitable for determining whether | ||
| user traffic should be directed at a given node, for example by a load | ||
| balancer. In this mode, a successful response is returned only if the | ||
| node: | ||
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| - is not in the process of shutting down or booting up (including | ||
| waiting for cluster bootstrap); | ||
| - is regarded as healthy by the cluster via the recent broadcast of | ||
| a liveness beacon. Absent either of these conditions, an error | ||
| code will result. | ||
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| Support status: [public](#support-status) | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | ready | [bool](#bool) | | ready specifies whether the client wants to know whether the target node is ready to receive traffic. If a node is unready, an error will be returned. | [public](#support-status) | | ||
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| <a name="cockroach.server.serverpb.HealthResponse"></a> | ||
| #### HealthResponse | ||
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| HealthResponse is the response to HealthRequest. It currently does not | ||
| contain any information. | ||
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| Support status: [public](#support-status) | ||
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| <a name="cockroach.server.status.statuspb.NodeStatus"></a> | ||
| #### NodeStatus | ||
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| NodeStatus records the most recent values of metrics for a node. | ||
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| Support status: [alpha](#support-status) | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | desc | [cockroach.roachpb.NodeDescriptor](#cockroach.roachpb.NodeDescriptor) | | desc is the node descriptor. | [reserved](#support-status) | | ||
| | build_info | [cockroach.build.Info](#cockroach.build.Info) | | build_info describes the `cockroach` executable file. | [alpha](#support-status) | | ||
| | started_at | [int64](#int64) | | started_at is the unix timestamp at which the node process was last started. | [alpha](#support-status) | | ||
| | updated_at | [int64](#int64) | | updated_at is the unix timestamp at which the node status record was last updated. | [alpha](#support-status) | | ||
| | metrics | [NodeStatus.MetricsEntry](#cockroach.server.status.statuspb.NodeStatus.MetricsEntry) | repeated | metrics contains the last sampled values for the node metrics. | [reserved](#support-status) | | ||
| | store_statuses | [StoreStatus](#cockroach.server.status.statuspb.StoreStatus) | repeated | store_statuses provides the store status payloads for all the stores on that node. | [reserved](#support-status) | | ||
| | args | [string](#string) | repeated | args is the list of command-line arguments used to last start the node. | [reserved](#support-status) | | ||
| | env | [string](#string) | repeated | env is the list of environment variables that influenced the node's configuration. | [reserved](#support-status) | | ||
| | latencies | [NodeStatus.LatenciesEntry](#cockroach.server.status.statuspb.NodeStatus.LatenciesEntry) | repeated | latencies is a map of nodeIDs to nanoseconds which is the latency between this node and the other node.<br><br>NOTE: this is deprecated and is only set if the min supported cluster version is >= VersionRPCNetworkStats. | [reserved](#support-status) | | ||
| | activity | [NodeStatus.ActivityEntry](#cockroach.server.status.statuspb.NodeStatus.ActivityEntry) | repeated | activity is a map of nodeIDs to network statistics from this node to other nodes. | [reserved](#support-status) | | ||
| | total_system_memory | [int64](#int64) | | total_system_memory is the total RAM available to the system (or, if detected, the memory available to the cgroup this process is in) in bytes. | [alpha](#support-status) | | ||
| | num_cpus | [int32](#int32) | | num_cpus is the number of logical CPUs as reported by the operating system on the host where the `cockroach` process is running. Note that this does not report the number of CPUs actually used by `cockroach`; this parameter is controlled separately. | [alpha](#support-status) | | ||
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| <a name="cockroach.server.status.statuspb.NodeStatus.MetricsEntry"></a> | ||
| #### NodeStatus.MetricsEntry | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | key | [string](#string) | | | | | ||
| | value | [double](#double) | | | | | ||
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| <a name="cockroach.server.status.statuspb.StoreStatus"></a> | ||
| #### StoreStatus | ||
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| StoreStatus records the most recent values of metrics for a store. | ||
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| Support status: [reserved](#support-status) | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | desc | [cockroach.roachpb.StoreDescriptor](#cockroach.roachpb.StoreDescriptor) | | desc is the store descriptor. | [reserved](#support-status) | | ||
| | metrics | [StoreStatus.MetricsEntry](#cockroach.server.status.statuspb.StoreStatus.MetricsEntry) | repeated | metrics contains the last sampled values for the node metrics. | [reserved](#support-status) | | ||
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| <a name="cockroach.server.status.statuspb.StoreStatus.MetricsEntry"></a> | ||
| #### StoreStatus.MetricsEntry | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | key | [string](#string) | | | | | ||
| | value | [double](#double) | | | | | ||
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| <a name="cockroach.server.status.statuspb.NodeStatus.LatenciesEntry"></a> | ||
| #### NodeStatus.LatenciesEntry | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | key | [int32](#int32) | | | | | ||
| | value | [int64](#int64) | | | | | ||
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| <a name="cockroach.server.status.statuspb.NodeStatus.ActivityEntry"></a> | ||
| #### NodeStatus.ActivityEntry | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | key | [int32](#int32) | | | | | ||
| | value | [NodeStatus.NetworkActivity](#cockroach.server.status.statuspb.NodeStatus.NetworkActivity) | | | | | ||
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| <a name="cockroach.server.status.statuspb.NodeStatus.NetworkActivity"></a> | ||
| #### NodeStatus.NetworkActivity | ||
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| Support status: [reserved](#support-status) | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | incoming | [int64](#int64) | | in bytes | [reserved](#support-status) | | ||
| | outgoing | [int64](#int64) | | in bytes | [reserved](#support-status) | | ||
| | latency | [int64](#int64) | | in nanoseconds | [reserved](#support-status) | | ||
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| <a name="cockroach.server.serverpb.NodesResponse.LivenessByNodeIdEntry"></a> | ||
| #### NodesResponse.LivenessByNodeIdEntry | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | key | [int32](#int32) | | | | | ||
| | value | [cockroach.kv.kvserver.liveness.livenesspb.NodeLivenessStatus](#cockroach.kv.kvserver.liveness.livenesspb.NodeLivenessStatus) | | | | | ||
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| <a name="cockroach.server.serverpb.NodesRequest"></a> | ||
| #### NodesRequest | ||
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| NodesRequest requests a copy of the node information as known to gossip | ||
| and the KV layer. | ||
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| Support status: [alpha](#support-status) | ||
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| <a name="cockroach.server.serverpb.NodesResponse"></a> | ||
| #### NodesResponse | ||
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| NodesResponse describe the nodes in the cluster. | ||
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| Support status: [alpha](#support-status) | ||
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| | Field | Type | Label | Description | Support status | | ||
| | ----- | ---- | ----- | ----------- | -------------- | | ||
| | nodes | [cockroach.server.status.statuspb.NodeStatus](#cockroach.server.status.statuspb.NodeStatus) | repeated | nodes carries the status payloads for all nodes in the cluster. | [alpha](#support-status) | | ||
| | liveness_by_node_id | [NodesResponse.LivenessByNodeIdEntry](#cockroach.server.serverpb.NodesResponse.LivenessByNodeIdEntry) | repeated | liveness_by_node_id maps each node ID to a liveness status. | [reserved](#support-status) | | ||
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