Unable to render snapshot when $__interval in expr

[pschonmann]

Using grafana 10.1.1

root@prometheus:~# grafana-snapshots -d https___google_com_2024-09-21_101558_1541855 -f 2024-09-22T00:00:00 -t 2024-09-23T00:00:00 -v
datasources OK.
panel: {'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'gridPos': {'h': 4, 'w': 19, 'x': 0, 'y': 0}, 'id': 4, 'options': {'code': {'language': 'plaintext', 'showLineNumbers': False, 'showMiniMap': False}, 'content': '<table style="width:100%; height:100%;border:0px solid black;">\n     <tr>\n     <td style="text-align: center;vertical-align: middle;border:0px solid black; ">\n<span style="font-size:30px">\n    Měření doby odezvy webu\n</span>\n</td>\n</tr>\n<tr>\n     <td style="text-align: center;vertical-align: middle;border:0px solid black; ">\n<span style="font-size:30px;font-weight:900">\n    https://google.com\n</span>\n</td>\n</tr>\n</table>', 'mode': 'markdown'}, 'pluginVersion': '10.1.1', 'targets': [{'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'refId': 'A'}], 'type': 'text'}
dtsrc: {'type': 'prometheus', 'uid': '000000001'}
target: [{'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'refId': 'A'}]
target expr is not defined: skipped!
panel: {'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'fieldConfig': {'defaults': {'color': {'mode': 'thresholds'}, 'mappings': [], 'thresholds': {'mode': 'absolute', 'steps': [{'color': 'green', 'value': None}, {'color': '#EAB839', 'value': 0.5}, {'color': 'red', 'value': 1}]}, 'unit': 's'}, 'overrides': []}, 'gridPos': {'h': 4, 'w': 5, 'x': 19, 'y': 0}, 'id': 3, 'options': {'colorMode': 'value', 'graphMode': 'none', 'justifyMode': 'auto', 'orientation': 'auto', 'reduceOptions': {'calcs': ['lastNotNull'], 'fields': '/^https://google\\.com$/', 'values': False}, 'textMode': 'auto'}, 'pluginVersion': '10.1.1', 'targets': [{'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'editorMode': 'code', 'exemplar': False, 'expr': 'sum(quantile_over_time(0.9, probe_http_duration_seconds{job="blackbox",instance="https://google.com",phase="processing"}[$__interval])) by (instance)', 'format': 'time_series', 'instant': True, 'interval': '1m', 'legendFormat': 'https://google.com', 'range': False, 'refId': 'A'}], 'title': '90 PERCENTIL - 24h', 'type': 'stat'}
dtsrc: {'type': 'prometheus', 'uid': '000000001'}
target: [{'datasource': {'type': 'prometheus', 'uid': '000000001'}, 'editorMode': 'code', 'exemplar': False, 'expr': 'sum(quantile_over_time(0.9, probe_http_duration_seconds{job="blackbox",instance="https://google.com",phase="processing"}[$__interval])) by (instance)', 'format': 'time_series', 'instant': True, 'interval': '1m', 'legendFormat': 'https://google.com', 'range': False, 'refId': 'A'}]
get_var_value_from_dashboard::value $__interval
found variable $__interval => "$__interval"
extract_vars::result expr="sum(quantile_over_time(0.9, probe_http_duration_seconds{job="blackbox",instance="https://google.com",phase="processing"}[$__interval])) by (instance)"
query GET datasource proxy uri: http://localhost:3000/api
invalid results...
can't obtain dashboard data... snapshot canceled!

[peekjef72]

Hi,

Thank you for reporting this issue.

Currently, granfana-snapshot-tool, as you have observed, doesn't handle the grafana "computed" variables $__interval.

The actual behavior is only to detect format $var or ${var}. (So that ${var:<format>} is not handle.)

Then, when the var_name var ( from $var) is detected, it is only substituted with a user defined value (simple python str.replace() function).
So, the user has to define the corresponding value via a "context" definition for that dashboard.
That is the exact purpose of the "context" feature:
In the granfana-snapshot-tool's config file you have to add a context part:

general:
 ...

grafana:
 ...

contexts:
  "dashboard_name": # in your context: https___google_com_2024-09-21_101558_1541855
    # time_from: "now-1h"
    # time_to: "now"
    vars:
       __interval: 2m # or what ever value you want.
     

Currently that is the only way to handle vars.
But I do agree that it may be a good idea to to have the same behavior than for grafana predefined vars.
Hope it can help.

JFPIK--