Hi sarahr202,
I hope you are having a blast! as you mentioned the output interface will aggregate all streams marked with EF to queue 2 hence I don't think and I have not found a way to see traffic for specific steam with a specific command, Nevertheless, you can place a network device facing f0/1 and use a firewall filter to count packets using the following matching criteria: from the source IP 1.1.1.1 and with DSCP EF in the ingress direction example:
host---f0/0-MX-f0/1--- [ingress FF(another network device)]
Please use rewrite rules on the MX to make sure the (network device) will receive the traffic with the EF DSCP
You can try a filter in the egress direction on the MX but I am not sure if this is supported since actions like then count or then log are not supported in a lot of devices in the egress direction.
If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/
Regards,
Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB