[USM] Introduce tail cals for the Postgres monitoring

[amitslavin]

What does this PR do?

Introduce the use of tail calls when parsing Postgres messages in both plain text and TLS modes.

Motivation

Reduce the Postgres support interaction count and complexity limits to allow for additional logic, which is currently blocked due to reaching instruction and complexity limits.

Describe how to test/QA your changes

Possible Drawbacks / Trade-offs

Additional Notes

TODO:

• Deploy to staging to validate accuracy

Results:

• No accuracy or performance impact was observed

| Filename/Program                               |   Stack Usage |   Instructions Processed |   Instructions Processed limit |   Max States per Instruction |   Peak States |   Total States |
|------------------------------------------------|---------------|--------------------------|--------------------------------|------------------------------|---------------|----------------|
| usm/socket__postgres_handle                    |            -8 |                        0 |                              0 |                            0 |             0 |              0 |
| usm/socket__postgres_handle_response           |             0 |                     -182 |                              0 |                            0 |             3 |              3 |
| usm/socket__postgres_process_parse_message     |             0 |                        0 |                              0 |                            0 |             0 |              0 |
| usm/uprobe__postgres_tls_handle                |             0 |                      -11 |                              0 |                           -1 |             1 |              1 |
| usm/uprobe__postgres_tls_handle_response       |            -8 |                      190 |                              0 |                            0 |             2 |              2 |
| usm/uprobe__postgres_tls_process_parse_message |             0 |                        0 |                              0 |                            0 |             0 |              0 |
| usm/uprobe__postgres_tls_termination           |             0 |                        0 |                              0 |                            0 |             0 |              0 |

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv create-vm --pipeline-id=48129003 --os-family=ubuntu

Note: This applies to commit 3d8e492

[cit-pr-commenter]

Regression Detector

[amitslavin]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in main is 22m.

Use /merge -c to cancel this operation!