Dashboard monitoring: Is there a way to check what the last message was when no event existed at a given time frame?

[pratapak]

Hi,

Is there a way to check what the last message was when no event existed at a given time frame?

Problem statement:
I am creating a widget to display connection status. If connection is successful, I'm displaying "0" and for failed connection I'm displaying "1" , and it's working fine

Log message:

11:30:15.623 AM logger:  com.nsc.ingestion.hono.receiver.HonoReceiver   
     message:    2018-09-22T11:30:15,622+0000 comp=hub-lora-ingestor-0 [vert.x-eventloop-thread-0] INFO  com.bosch.iot.deepfield.ingestion.hono.receiver.HonoReceiver - Connected successfully, creating telemetry consumer ...

11:20:15.127 AM logger:  com.nsc.ingestion.hono.receiver.HonoReceiver   
     message:    2018-09-22T11:30:15,127+0000 comp=hub-lora-ingestor-0 [vert.x-eventloop-thread-0] INFO  com.bosch.iot.deepfield.ingestion.hono.receiver.HonoReceiver - Connecting ...

My search query

(index="05c48b55-c9aa-4743-aa4b-c0ec618691dd"  ( "Connecting ..." OR "Connected successfully, creating telemetry consumer ...")) 
| rex field=_raw "-\s(?<status_message>.*)" 
| eval status=if(like(status_message,"%Connected successfully, creating telemetry consumer%"), 0, 1)
| timechart latest(status) as status span=10m 
| rename status as "Connection Status (0=success, 1=failed/reconnecting)"

Chart is displaying "1" at 11:20 and "0" at 11:30, but for 11:40 also it's displaying "0" because it's considering no value as "0" as there is not log message at 11:40.

So, how can I get the last log message (latest message) when event doesn't exist at a given time frame and evaluate?

[richgalloway]

Try this untested query:

(index="05c48b55-c9aa-4743-aa4b-c0ec618691dd"  ( "Connecting ..." OR "Connected successfully, creating telemetry consumer ...")) 
| rex field=_raw "-\s(?<status_message>.*)" 
| eval status=if(like(status_message,"%Connected successfully, creating telemetry consumer%"), 0, 1)
| timechart latest(status) as status span=10m 
| filldown status
| rename status as "Connection Status (0=success, 1=failed/reconnecting)"

[pratapak]

@richgalloway thanks for the answer. But unfortunately it's not working.