[BUG] Metrics view uses the "time" field for filtering which is inconsistent with the SS4O schema

[panekk]

What is the bug?

The SS4O metrics mapping doesn't list a top-level time field, but it is used by the observability dashboard to display metrics. As a result, documents that don't contain the time field are completely filtered out. This seems to be inconsistent with the SS4O template that doesn't contain the time field.

Note: this is my observation when I had a leftover rename from time to @timestamp coming from before I started using the unified source in Data Prepper (OSIS). Currently, the data I have contains both time and @timestamp, but I'm still confused by the lack of time in the reference mapping and unsure if using the time field is a well-defined behavior.

How can one reproduce the bug?

1. Configure a datastream using the reference mapping: https://github.com/opensearch-project/opensearch-catalog/blob/main/schema/observability/metrics/1.0.1/metrics-datastream-1.0.1.mapping
2. Push a document with histogram and with the @timestamp field instead of time to the ss4o_metrics-otel-default index.
3. Go to Metrics view, select a specific metric. The labels on X-axis are present, but no bars are rendered.

What is the expected behavior?

The @timestamp is used for filtering the documents.

What is your host/environment?
Setup 1:

• OS: Linux
• Version: OpenSearch 3.4.0 (official docker image)

Setup 2:

• AWS
• Version: OpenSearch 3.3 (latest); Service software version: OpenSearch_3_3_R20251121-P3 (latest)

Do you have any screenshots?

Do you have any additional context?

The filtering is applied here:

dashboards-observability/server/adaptors/metrics/metrics_analytics_adaptor.ts

Line 53 in 255ef2d

time: {

Sample document to reproduce the issue

{
  "metadata": {},
  "instrumentationScope": {
    "name": "__main__",
    "droppedAttributesCount": 0
  },
  "max": 0,
  "resource": {
    "droppedAttributesCount": 0,
    "attributes": {
      "telemetry.sdk.language": "python",
      "service.name": "histogram-metrics-generator",
      "telemetry.sdk.version": "1.39.1",
      "service.namespace": "testing",
      "telemetry.sdk.name": "opentelemetry"
    },
    "schemaUrl": ""
  },
  "kind": "HISTOGRAM",
  "buckets": [
    {
      "min": -3.4028234663852886e+38,
      "max": 10,
      "count": 0
    },
    {
      "min": 10,
      "max": 25,
      "count": 1
    },
    {
      "min": 25,
      "max": 50,
      "count": 4
    },
    {
      "min": 50,
      "max": 100,
      "count": 32
    },
    {
      "min": 100,
      "max": 150,
      "count": 6
    },
    {
      "min": 150,
      "max": 200,
      "count": 0
    },
    {
      "min": 200,
      "max": 250,
      "count": 0
    },
    {
      "min": 250,
      "max": 300,
      "count": 0
    },
    {
      "min": 300,
      "max": 400,
      "count": 0
    },
    {
      "min": 400,
      "max": 500,
      "count": 0
    },
    {
      "min": 500,
      "max": 750,
      "count": 0
    },
    {
      "min": 750,
      "max": 1000,
      "count": 0
    },
    {
      "min": 1000,
      "max": 1500,
      "count": 0
    },
    {
      "min": 1500,
      "max": 2000,
      "count": 0
    },
    {
      "min": 2000,
      "max": 3000,
      "count": 0
    },
    {
      "min": 3000,
      "max": 5000,
      "count": 0
    },
    {
      "min": 5000,
      "max": 3.4028234663852886e+38,
      "count": 0
    }
  ],
  "count": 43,
  "bucketCountsList": [
    0,
    0,
    1,
    0,
    2,
    1,
    18,
    18,
    3,
    0,
    0,
    0,
    0,
    0,
    0
  ],
  "flags": 0,
  "description": "Database query duration in milliseconds",
  "sum": 2155.8211954598473,
  "schemaUrl": "",
  "unit": "",
  "aggregationTemporality": "AGGREGATION_TEMPORALITY_UNSPECIFIED",
  "min": 0,
  "exemplars": {},
  "bucketCounts": 15,
  "name": "database.query.duration",
  "startTime": "1970-01-01T00:00:00Z",
  "explicitBoundsCount": 14,
  "attributes": {
    "query_type": "UPDATE",
    "device.id": "a2c108c2-ae27-449f-a1b9-0ba11938a2f9",
    "table": "inventory"
  },
  "explicitBounds": [
    5,
    10,
    15,
    20,
    25,
    30,
    50,
    75,
    100,
    150,
    200,
    300,
    500,
    1000
  ],
  "@timestamp": "2026-02-02T12:16:24.827740305Z"
}

[andrross]

Catch All Triage - 1