github.com/muhammadn/cortex@v1.9.1-0.20220510110439-46bb7000d03d/docs/guides/limitations.md (about)

     1  ---
     2  title: "Limitations"
     3  linkTitle: "Limitations"
     4  weight: 998
     5  slug: limitations
     6  ---
     7  
     8  ## Tenant ID naming
     9  
    10  The tenant ID (also called "user ID" or "org ID") is the unique identifier of a tenant within a Cortex cluster. The tenant ID is an opaque information to Cortex, which doesn't make any assumption on its format/content, but its naming has two limitations:
    11  
    12  1. Supported characters
    13  2. Length
    14  
    15  ### Supported characters
    16  
    17  The following character sets are generally **safe for use in the tenant ID**:
    18  
    19  - Alphanumeric characters
    20    - `0-9`
    21    - `a-z`
    22    - `A-Z`
    23  - Special characters
    24    - Exclamation point (`!`)
    25    - Hyphen (`-`)
    26    - Underscore (`_`)
    27    - Single Period (`.`), but the tenant IDs `.` and `..` is considered invalid
    28    - Asterisk (`*`)
    29    - Single quote (`'`)
    30    - Open parenthesis (`(`)
    31    - Close parenthesis (`)`)
    32  
    33  All other characters are not safe to use. In particular, slashes `/` and whitespaces (` `) are **not supported**.
    34  
    35  ### Length
    36  
    37  The tenant ID length should not exceed 150 bytes/characters.
    38  
    39  ## Query without metric name
    40  
    41  The Cortex chunks storage doesn't support queries without a metric name, like `count({__name__=~".+"})`. On the contrary, the Cortex [blocks storage](../blocks-storage/_index.md) supports it.
    42  
    43  ## Query series and labels
    44  
    45  When running queries to the `/api/v1/series`, `/api/v1/labels` and `/api/v1/label/{name}/values` endpoints, query's time range is ignored and the data is always fetched from ingesters. There is experimental support to query the long-term store with the *blocks* storage engine when `-querier.query-store-for-labels-enabled` is set.