Prometheus metrics with timestamp

Question

When I query metrics from prometheus, I just get the timestamp when I queried.

For example, If I query data like this,

http://localhost:9090/api/v1/query?query=go_memstats_buck_hash_sys_bytes

Then I got the response like following.

{
    "status": "success",
    "data": {
        "resultType": "vector",
        "result": [
            {
                "metric": {
                    "__name__": "go_memstats_buck_hash_sys_bytes",
                    "instance": "localhost:9090",
                    "job": "prometheus"
                },
                "value": [
                    1557366670.588, <== UNIX time stamp when I queried.
                    "1472884" <== Value
                ]
            }
        ]
    }
}

But in the graph view, I can see the graph like following. It means I can query data with timestamp that prometheus.

I wanna know how to query metrics with timestamp that prometheus has.

Answer 1

I found the answer, I need the time range like following.

http://localhost:9090/api/v1/query?query=go_memstats_buck_hash_sys_bytes[5m]

Then the result is,

{
    "status": "success",
    "data": {
        "resultType": "matrix",
        "result": [
            {
                "metric": {
                    "__name__": "go_memstats_buck_hash_sys_bytes",
                    "instance": "localhost:9090",
                    "job": "prometheus"
                },
                "values": [
                    [
                        1557369023.318,
                        "1491644"
                    ],
                    [
                        1557369028.318,
                        "1491644"
                    ],
                    [
                        1557369033.282,
                        "1491644"
                    ],
      .........
                ]
            }
        ]
    }
}