output: add retry_limit_is_set flag

Add a boolean to flb_output_instance that tracks whether
retry_limit was explicitly set by the user. This allows
plugins to distinguish between the engine default and an
explicit user configuration.

Co-authored-by: Thean Lim <theanlim@amazon.com>
Signed-off-by: Anuj Singh <singholt@amazon.com>

Author: 2 people

include/fluent-bit/flb_output.h

@@ -355,6 +355,7 @@ struct flb_output_instance {
 
     /* Plugin properties */
     int retry_limit;                     /* max of retries allowed       */
+    int retry_limit_is_set;              /* explicitly set by user?      */
     int use_tls;                         /* bool, try to use TLS for I/O */
     char *match;                         /* match rule for tag/routing   */
 #ifdef FLB_HAVE_REGEX

src/flb_output.c

@@ -778,6 +778,7 @@ struct flb_output_instance *flb_output_new(struct flb_config *config,
     instance->match_regex = NULL;
 #endif
     instance->retry_limit = 1;
+    instance->retry_limit_is_set = FLB_FALSE;
     instance->host.name   = NULL;
     instance->host.address = NULL;
     instance->net_config_map = NULL;
@@ -940,6 +941,7 @@ int flb_output_set_property(struct flb_output_instance *ins,
         flb_sds_destroy(tmp);
     }
     else if (prop_key_check("retry_limit", k, len) == 0) {
+        ins->retry_limit_is_set = FLB_TRUE;
         if (tmp) {
             if (strcasecmp(tmp, "no_limits") == 0 ||
                 strcasecmp(tmp, "false") == 0 ||