> ## Documentation Index
> Fetch the complete documentation index at: https://kb.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Query logs under a span

> Retrieves the logs under specific span (or all logs from trace, if span_id is omitted)

## OpenAPI

````json GET /span-logs
{
  "openapi": "3.0.3",
  "info": {
    "title": "VAST DataEngine API",
    "description": "Combined OpenAPI specification for Document360: Provisioning, Telemetries Query, Telemetries Collector, and shared common components.",
    "version": "1.4.0"
  },
  "servers": [
    {
      "url": "http://localhost:3000",
      "description": "Provisioning Service (Local development server)"
    },
    {
      "url": "http://localhost:8080/query_telemetries",
      "description": "Telemetries Query Service (Local development server)"
    },
    {
      "url": "http://localhost:8080/telemetries",
      "description": "Telemetries Collector Service (Local development server)"
    }
  ],
  "tags": [
    {
      "name": "Provisioning Service v1.4.0",
      "description": "Provisioning Service API"
    },
    {
      "name": "Provisioning Service v1.4.0 > dataEngine",
      "description": "Data Engine lifecycle"
    },
    {
      "name": "Provisioning Service v1.4.0 > setup_provisioning",
      "description": "Deprecated provisioning setup"
    },
    {
      "name": "Provisioning Service v1.4.0 > pipelines",
      "description": "Pipelines"
    },
    {
      "name": "Provisioning Service v1.4.0 > pipelineRevisions",
      "description": "Pipeline revisions"
    },
    {
      "name": "Provisioning Service v1.4.0 > functions",
      "description": "Functions"
    },
    {
      "name": "Provisioning Service v1.4.0 > functionRevisions",
      "description": "Function revisions"
    },
    {
      "name": "Provisioning Service v1.4.0 > functionRevisionsDeprecated",
      "description": "Deprecated function revision endpoints"
    },
    {
      "name": "Provisioning Service v1.4.0 > triggers",
      "description": "Triggers"
    },
    {
      "name": "Provisioning Service v1.4.0 > topics",
      "description": "Topics"
    },
    {
      "name": "Provisioning Service v1.4.0 > containerRegistries",
      "description": "Container registries"
    },
    {
      "name": "Provisioning Service v1.4.0 > kubernetesClusters",
      "description": "Kubernetes clusters"
    },
    {
      "name": "Provisioning Service v1.4.0 > kubernetesSecrets",
      "description": "Kubernetes secrets"
    },
    {
      "name": "Provisioning Service v1.4.0 > mtlsAuthenticationCredentials",
      "description": "mTLS authentication credentials"
    },
    {
      "name": "Provisioning Service v1.4.0 > dashboard",
      "description": "Dashboard"
    },
    {
      "name": "Provisioning Service v1.4.0 > reports",
      "description": "Saved reports"
    },
    {
      "name": "Telemetries Collector Service v1.4.0",
      "description": "API for collecting OTEL signals (traces, logs and metrics)"
    },
    {
      "name": "Telemetries Collector Service v1.4.0 > collect_telemetries",
      "description": "Collect OTEL signals"
    },
    {
      "name": "Telemetries Query Service v1.4.0",
      "description": "API for querying traces, logs and metrics"
    },
    {
      "name": "Telemetries Query Service v1.4.0 > query_telemetries",
      "description": "Query traces and logs"
    },
    {
      "name": "Telemetries Query Service v1.4.0 > metrics",
      "description": "Query metrics"
    },
    {
      "name": "Telemetries Query Service v1.4.0 > reports",
      "description": "Saved reports"
    }
  ],
  "paths": {
    "/span-logs": {
      "get": {
        "parameters": [
          {
            "$ref": "#/components/parameters/TraceId"
          },
          {
            "$ref": "#/components/parameters/SpanId"
          }
        ],
        "summary": "Query logs under a span",
        "description": "Retrieves the logs under specific span (or all logs from trace, if span_id is omitted)",
        "operationId": "query_span_logs",
        "tags": [
          "Telemetries Query Service v1.4.0 > query_telemetries"
        ],
        "responses": {
          "200": {
            "description": "A list of log records",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "pagination": {
                      "$ref": "#/components/schemas/Pagination"
                    },
                    "data": {
                      "type": "array",
                      "items": {
                        "$ref": "#/components/schemas/LogRecordResult"
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "parameters": {
      "TraceId": {
        "name": "trace_id",
        "in": "query",
        "required": "false",
        "schema": {
          "type": "string",
          "description": "ID of the Trace assoicated with the telemetries"
        }
      },
      "SpanId": {
        "name": "span_id",
        "in": "query",
        "required": "false",
        "schema": {
          "type": "string",
          "description": "ID of the Span assoicated with the telemetries"
        }
      }
    },
    "schemas": {
      "Pagination": {
        "allOf": [
          {
            "type": "object",
            "properties": {
              "next_cursor": {
                "type": "string",
                "description": "The cursor for the next page"
              },
              "previous_cursor": {
                "type": "string",
                "description": "The cursor for the last page"
              }
            }
          }
        ]
      },
      "LogRecordResult": {
        "allOf": [
          {
            "$ref": "#/components/schemas/LogRecord"
          },
          {
            "type": "object",
            "properties": {
              "resource": {
                "$ref": "#/components/schemas/TelemetryResource"
              }
            }
          }
        ]
      },
      "LogRecord": {
        "type": "object",
        "description": "Log record from Vast Function execution",
        "properties": {
          "guid": {
            "type": "string",
            "description": "Unique identifier of the logs"
          },
          "trace_id": {
            "type": "string",
            "description": "ID of the Trace this Log is associated with"
          },
          "span_id": {
            "type": "string",
            "description": "ID of the Span this Log is associated with"
          },
          "timestamp": {
            "type": "integer",
            "format": "int64",
            "description": "Time in epoch in micro sec for when the Log record was produced"
          },
          "observed_timestamp": {
            "type": "integer",
            "format": "int64",
            "description": "Time since epoch in micro sec for when the Log record was observed by Vast Telemetries Service"
          },
          "severity": {
            "type": "string",
            "description": "Log severity matching OTEL specification"
          },
          "scope": {
            "type": "string"
          },
          "message": {
            "type": "string",
            "description": "Content of the Log Record"
          }
        }
      },
      "TelemetryResource": {
        "type": "object",
        "description": "Resource producing the telemetry, as in OTEL specification",
        "properties": {
          "tenant_id": {
            "type": "string",
            "description": "ID of the tenant",
            "example": "tenant.id",
            "x-otel-loc": "tenant.id"
          },
          "pipeline_id": {
            "type": "string",
            "description": "ID of the Pipeline",
            "example": "vastpipeline.id",
            "x-otel-loc": "vastpipeline.id"
          },
          "pipeline_name": {
            "type": "string",
            "description": "Name of the Pipeline",
            "x-otel-loc": "vastpipeline.name"
          },
          "pipeline_version": {
            "type": "string",
            "description": "Version of the Pipeline",
            "x-otel-loc": "vastpipeline.version"
          },
          "pipeline_revision_id": {
            "type": "string",
            "description": "ID of the Pipeline Revision",
            "x-otel-loc": "vastpipeline.rev_id"
          },
          "function_revision_id": {
            "type": "string",
            "description": "ID of the Function Revision",
            "x-otel-loc": "vastfunction.rev_id"
          },
          "pipeline_vrn": {
            "type": "string",
            "description": "VRN of the Pipeline"
          },
          "function_id": {
            "type": "string",
            "description": "ID of the Function",
            "x-otel-loc": "vastfunction.id"
          },
          "function_name": {
            "type": "string",
            "description": "Name of the Function",
            "x-otel-loc": "vastfunction.name"
          },
          "function_deployment_name": {
            "type": "string",
            "description": "Name of the Function Deployment as in Pipeline manifest",
            "x-otel-loc": "vastfunction.deployment_name"
          },
          "function_vrn": {
            "type": "string",
            "description": "VRN of the Function"
          },
          "function_version": {
            "type": "string",
            "description": "Version of the Function",
            "x-otel-loc": "vastfunction.version"
          },
          "function_host": {
            "type": "string",
            "description": "Name of the pod where the function is running",
            "x-otel-loc": "vastfunction.host"
          },
          "function_deployment_vrn": {
            "type": "string",
            "description": "VRN of the Function Deployment (i.e. the function used in the pipeline manifest)"
          },
          "sdk_version": {
            "type": "string",
            "description": "Serverless SDK installed in the user code",
            "x-otel-loc": "vastfunction.sdk_version"
          },
          "runtime_version": {
            "type": "string",
            "description": "Serverless runtime invoking user code",
            "x-otel-loc": "vastfunction.runtime_version"
          },
          "owner_vid": {
            "type": "integer",
            "format": "int64",
            "description": "The owner's vid associated with with the telemetry - the relevant pipeline owner",
            "x-otel-loc": "vastpipeline.owner_vid"
          }
        }
      }
    }
  }
}
````