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API Reference
Workers
Observability
Telemetry

List keys

POST/accounts/{account_id}/workers/observability/telemetry/keys

List all the keys in your telemetry events.

Security
API Email + API Key

The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.

Example:X-Auth-Email: user@example.com

The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.

Example:X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194
API Token

The preferred authorization scheme for interacting with the Cloudflare API. Create a token.

Example:Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY
User Service Key

Used when interacting with the Origin CA certificates API. View/change your key.

Example:X-Auth-User-Service-Key: v1.0-144c9defac04969c7bfad8ef-631a41d003a32d25fe878081ef365c49503f7fada600da935e2851a1c7326084b85cbf6429c4b859de8475731dc92a9c329631e6d59e6c73da7b198497172b4cefe071d90d0f5d2719
Accepted Permissions (at least one required)
Workers Observability Write
Path ParametersExpand Collapse
account_id: string
Body ParametersJSONExpand Collapse
datasets: optional array of string

Leave this empty to use the default datasets

filters: optional array of object { filterCombination, filters, kind } or object { key, operation, type, 2 more }

Apply filters to narrow key discovery. Supports nested groups via kind: ‘group’. Maximum nesting depth is 4.

One of the following:
object { filterCombination, filters, kind }
filterCombination: "and" or "or" or "AND" or "OR"
One of the following:
"and"
"or"
"AND"
"OR"
filters: array of object { filterCombination, filters, kind } or object { key, operation, type, 2 more }
One of the following:
object { filterCombination, filters, kind }
filterCombination: "and" or "or" or "AND" or "OR"
One of the following:
"and"
"or"
"AND"
"OR"
filters: array of unknown
kind: "group"
WorkersObservabilityFilterLeaf object { key, operation, type, 2 more }

A filter condition applied to query results. Use the keys and values endpoints to discover available fields and their values before constructing filters.

key: string

Filter field name. Use verified keys from previous query results or the keys endpoint. Common keys include $metadata.service, $metadata.origin, $metadata.trigger, $metadata.message, and $metadata.error.

operation: "includes" or "not_includes" or "starts_with" or 25 more

Comparison operator. String operators: includes, not_includes, starts_with, regex. Existence: exists, is_null. Set membership: in, not_in (comma-separated values). Numeric: eq, neq, gt, gte, lt, lte.

One of the following:
"includes"
"not_includes"
"starts_with"
"regex"
"exists"
"is_null"
"in"
"not_in"
"eq"
"neq"
"gt"
"gte"
"lt"
"lte"
"="
"!="
">"
">="
"<"
"<="
"INCLUDES"
"DOES_NOT_INCLUDE"
"MATCH_REGEX"
"EXISTS"
"DOES_NOT_EXIST"
"IN"
"NOT_IN"
"STARTS_WITH"
type: "string" or "number" or "boolean"

Data type of the filter field. Must match the actual type of the key being filtered.

One of the following:
"string"
"number"
"boolean"
kind: optional "filter"

Discriminator for leaf filter nodes. Always ‘filter’ when present; may be omitted.

value: optional string or number or boolean

Comparison value. Must match actual values in your data — verify with the values endpoint. Ensure the value type (string/number/boolean) matches the field type. String comparisons are case-sensitive. Regex uses RE2 syntax (no lookaheads/lookbehinds).

One of the following:
string
number
boolean
kind: "group"
WorkersObservabilityFilterLeaf object { key, operation, type, 2 more }

A filter condition applied to query results. Use the keys and values endpoints to discover available fields and their values before constructing filters.

key: string

Filter field name. Use verified keys from previous query results or the keys endpoint. Common keys include $metadata.service, $metadata.origin, $metadata.trigger, $metadata.message, and $metadata.error.

operation: "includes" or "not_includes" or "starts_with" or 25 more

Comparison operator. String operators: includes, not_includes, starts_with, regex. Existence: exists, is_null. Set membership: in, not_in (comma-separated values). Numeric: eq, neq, gt, gte, lt, lte.

One of the following:
"includes"
"not_includes"
"starts_with"
"regex"
"exists"
"is_null"
"in"
"not_in"
"eq"
"neq"
"gt"
"gte"
"lt"
"lte"
"="
"!="
">"
">="
"<"
"<="
"INCLUDES"
"DOES_NOT_INCLUDE"
"MATCH_REGEX"
"EXISTS"
"DOES_NOT_EXIST"
"IN"
"NOT_IN"
"STARTS_WITH"
type: "string" or "number" or "boolean"

Data type of the filter field. Must match the actual type of the key being filtered.

One of the following:
"string"
"number"
"boolean"
kind: optional "filter"

Discriminator for leaf filter nodes. Always ‘filter’ when present; may be omitted.

value: optional string or number or boolean

Comparison value. Must match actual values in your data — verify with the values endpoint. Ensure the value type (string/number/boolean) matches the field type. String comparisons are case-sensitive. Regex uses RE2 syntax (no lookaheads/lookbehinds).

One of the following:
string
number
boolean
from: optional number
keyNeedle: optional object { value, isRegex, matchCase }

If the user suggests a key, use this to narrow down the list of keys returned. Make sure matchCase is false to avoid case sensitivity issues.

value: string or number or boolean

The text or pattern to search for.

maxLength1000
One of the following:
string
number
boolean
isRegex: optional boolean

When true, treats the value as a regular expression (RE2 syntax).

matchCase: optional boolean

When true, performs a case-sensitive search. Defaults to case-insensitive.

limit: optional number

Advanced usage: set limit=1000+ to retrieve comprehensive key options without needing additional filtering.

needle: optional object { value, isRegex, matchCase }

Search for a specific substring in any of the events

value: string or number or boolean

The text or pattern to search for.

maxLength1000
One of the following:
string
number
boolean
isRegex: optional boolean

When true, treats the value as a regular expression (RE2 syntax).

matchCase: optional boolean

When true, performs a case-sensitive search. Defaults to case-insensitive.

to: optional number
ReturnsExpand Collapse
errors: array of object { message }
message: string
messages: array of object { message }
message: "Successful request"
result: array of object { key, lastSeenAt, type }
key: string
lastSeenAt: number
type: "string" or "boolean" or "number"
One of the following:
"string"
"boolean"
"number"
success: true

List keys

curl https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/workers/observability/telemetry/keys \
    -H 'Content-Type: application/json' \
    -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
    -H "X-Auth-Key: $CLOUDFLARE_API_KEY" \
    -d '{}'
{
  "errors": [
    {
      "message": "message"
    }
  ],
  "messages": [
    {
      "message": "Successful request"
    }
  ],
  "result": [
    {
      "key": "key",
      "lastSeenAt": 0,
      "type": "string"
    }
  ],
  "success": true
}
Returns Examples
{
  "errors": [
    {
      "message": "message"
    }
  ],
  "messages": [
    {
      "message": "Successful request"
    }
  ],
  "result": [
    {
      "key": "key",
      "lastSeenAt": 0,
      "type": "string"
    }
  ],
  "success": true
}