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[receiver/datadog] Implement '/info' endpoint (#34772)
**Description:** <Describe what has changed.> The Datadog agent exposes a `/info` [endpoint](https://github.com/DataDog/datadog-agent/blob/ab888632bb71bcd57716e3428ed4c242ed7b9aaa/pkg/trace/api/api.go#L205), communicating its available endpoints and capabilities. This endpoint is used for the [trace libraries](https://github.com/DataDog/dd-trace-java/blob/master/communication/src/main/java/datadog/communication/ddagent/DDAgentFeaturesDiscovery.java#L140-L173) to infer the features available in the queried agent, and make some decisions about the telemetry data at hand, including whether to send [client stats](https://github.com/DataDog/dd-trace-java/blob/master/communication/src/main/java/datadog/communication/ddagent/DDAgentFeaturesDiscovery.java#L40) for the [local sampled spans](https://github.com/DataDog/dd-trace-java/blob/master/dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java#L993-L1008) used to calculate the [trace metrics](https://docs.datadoghq.com/tracing/metrics/metrics_namespace/). PS: in order to dynamically expose the available endpoints, this PR also does a minor refactor on the endpoint configuration structure, defining them in a `[]Endpoint` rather than registering them directly in the `ServeMux`. **Link to tracking Issue:** **Testing:** **Documentation:** --------- Signed-off-by: Juraci Paixão Kröhling <[email protected]> Co-authored-by: Juraci Paixão Kröhling <[email protected]>
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| # Use this changelog template to create an entry for release notes. | ||
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| # One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix' | ||
| change_type: enhancement | ||
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| # The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver) | ||
| component: datadogreceiver | ||
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| # A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`). | ||
| note: Implement '/info' endpoint | ||
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| # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists. | ||
| issues: [34772] | ||
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| # (Optional) One or more lines of additional information to render under the primary note. | ||
| # These lines will be padded with 2 spaces and then inserted directly into the document. | ||
| # Use pipe (|) for multiline entries. | ||
| subtext: | ||
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| # If your change doesn't affect end users or the exported elements of any package, | ||
| # you should instead start your pull request title with [chore] or use the "Skip Changelog" label. | ||
| # Optional: The change log or logs in which this entry should be included. | ||
| # e.g. '[user]' or '[user, api]' | ||
| # Include 'user' if the change is relevant to end users. | ||
| # Include 'api' if there is a change to a library API. | ||
| # Default: '[user]' | ||
| change_logs: [] |
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| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| package translator // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/datadogreceiver/internal/translator" | ||
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| import ( | ||
| "github.com/DataDog/datadog-agent/pkg/obfuscate" | ||
| ) | ||
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| type ReducedObfuscationConfig struct { | ||
| ElasticSearch bool `json:"elastic_search"` | ||
| Mongo bool `json:"mongo"` | ||
| SQLExecPlan bool `json:"sql_exec_plan"` | ||
| SQLExecPlanNormalize bool `json:"sql_exec_plan_normalize"` | ||
| HTTP obfuscate.HTTPConfig `json:"http"` | ||
| RemoveStackTraces bool `json:"remove_stack_traces"` | ||
| Redis obfuscate.RedisConfig `json:"redis"` | ||
| Memcached obfuscate.MemcachedConfig `json:"memcached"` | ||
| } | ||
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| type ReducedConfig struct { | ||
| DefaultEnv string `json:"default_env"` | ||
| TargetTPS float64 `json:"target_tps"` | ||
| MaxEPS float64 `json:"max_eps"` | ||
| ReceiverPort int `json:"receiver_port"` | ||
| ReceiverSocket string `json:"receiver_socket"` | ||
| ConnectionLimit int `json:"connection_limit"` | ||
| ReceiverTimeout int `json:"receiver_timeout"` | ||
| MaxRequestBytes int64 `json:"max_request_bytes"` | ||
| StatsdPort int `json:"statsd_port"` | ||
| MaxMemory float64 `json:"max_memory"` | ||
| MaxCPU float64 `json:"max_cpu"` | ||
| AnalyzedSpansByService map[string]map[string]float64 `json:"analyzed_spans_by_service"` | ||
| Obfuscation ReducedObfuscationConfig `json:"obfuscation"` | ||
| } | ||
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| type DDInfo struct { | ||
| Version string `json:"version"` | ||
| Endpoints []string `json:"endpoints"` | ||
| ClientDropP0s bool `json:"client_drop_p0s"` | ||
| SpanMetaStructs bool `json:"span_meta_structs"` | ||
| LongRunningSpans bool `json:"long_running_spans"` | ||
| Config *ReducedConfig `json:"config"` | ||
| } |
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